Initial Reports Volume 185 Chapter 3, Table T4. Igneous core description log, Hole 801C. Notes: * = XRF analysis from Castillo et al. (1992), includes number of analyses per section; - = no data, Y = yes, N = no, XRF = X-ray fluorescence, PP = physical properties, TSB = thin-section billet, *2 = two samples. Cores 129-801C-1R to 12R were described in the “Site 801” chapter of the Leg 129 Initial Reports volume (Shipboard Scientific Party, 1990) and modified for consistency downhole during Leg 185 to include some subunits within the existing units. Cores 185-801C-13R to 52M are described in this chapter. Core, section Piece Analysis* Depth (mbsf) Interval Length (cm) Unit, Subunit Lithology Texture Structure Color Comments Chilled margin present Top Bottom (cm) Interval Unit Subunit Top Base 129-801C- 1R-1 1A-2G 3 493.70 494.94 0-124 124 361 - 1 Alkali aphyric microdolerite, sparsely plagioclase phyric basalt Medium to fine grained Sill White, speckled gray to black Massive unit no contacts, sparse plagioclase phenocrysts, no vesicles N Y 1R-2 1A - 3F 1 494.94 496.30 0-136 136 361 - 1 Same as above Same as above Sill Same as above - N Y 1R-3 1A -1G 1 496.30 497.31 0-101 101 361 - 1 Same as above Same as above Sill Same as above - N Y 1R-3 2 1 497.31 497.40 101-110 9 398 - 2 Sparsely plagioclase, olivine microphyric, aphyric basalt Fine to medium grained, massive Sill Brown/gray to speckled gray Diffuse contacts, grain size changes, mineral accumulation N Y 1R-4 1-2D 1 497.40 498.55 0-115 115 398 - 2 Same as above Same as above Sill Same as above - N Y 1R-5 1A-4B 2 498.55 499.97 0-142 142 398 - 2 Same as above Same as above Sill Same as above - N Y 1R-6 1-5 1 499.97 501.29 0-132 132 398 - 2 Same as above Same as above Sill Same as above - N Y 2R-1 1A-1F 2 503.00 504.38 0-138 138 344 - 3 Sparsely plagioclase phyric to aphyric alkali basalt Fine to glassy, massive Sill Gray brown to speckled gray Diffuse contacts, devitrified glassy rim, grain size coarsening downward Y N 2R-2 1A-1G 1 504.38 505.82 0-144 144 344 - 3 Same as above Same as above Sill Same as above - Y N 2R-3 1A-1D - 505.82 506.44 0-62 62 344 - 3 Same as above Same as above Sill Same as above - Y N 2R-3 2A-2D 1 506.44 506.93 62-111 49 49 - 4 Moderately plagioclase phyric, aphyric alkali basalt Fine to glassy, massive Sill Gray brown to speckled gray Diffuse/irregular contacts Y Y 2R-3 3 - 506.93 506.97 111-115 4 4 - 5 Aphyric alkali basalt Fine-grained unit Sill Gray Inclined contacts, thin sliver of lava flow, between intrusion of Units 4 and 6 Y Y 2R-3 3 1 506.97 507.06 115-124 9 266 - 6 Sparsely plagioclase phyric, aphyric basalt or microdolerite Fine to medium grained, massive Sill Gray speckled Contacts diffuse and inclined, defined by grain-size decrease, no glass Y N 2R-4 1A-1B 1 507.06 508.44 0-138 138 266 - 6 Same as above Same as above Sill Same as above - Y N 2R-5 1-2 1 508.44 509.63 0-119 119 266 - 6 Same as above Same as above Sill Same as above - Y N 3R-1 1-3B 2 512.20 513.18 0-98 98 98 - 7 Aphyric alkali basalt Fine grained, massive Sill Purple gray/brown Diffuse contacts, quench textured, some plagioclase microphenocrysts at base Y Y 4R-1 1-12 1 521.70 523.07 0-137 137 266 - 8 Hydrothermal deposit Fine grained and wavy lamination Hydrothermal Red brown and yellow Silicified red and yellow breccia, chemical Fe-Si deposit N N 4R-2 1A-15 - 523.07 524.36 0-129 129 266 - 8 Same as above Same as above Hydrothermal Same as above - N N 5R-1 1-2 - 531.20 531.54 0-34 34 232 34 9-1 Interflow material or sediment Fine to medium grained Sediment Pale brown or greenish gray Interflow sediment or very highly altered basalt N N 5R-1 2-4 3 531.54 532.46 34-126 92 232 222 9-2 Highly to moderately plagioclase megaphyric basalt Fine to medium grained, spherulitic, thin flow/pile of pillows Pillow breccia Greenish gray Brecciated pillows, highly altered, no vesicles, highly altered at top Y Y 5R-2 1A-2E 3 532.46 533.76 0-130 130 232 222 9-2 Same as above Same as above Pillow breccia Same as above - Y Y 5R-3 1A-1F 3 533.76 534.44 0-68 68 232 68 9-3 Moderately plagioclase megaphyric basalt Fine grained Pillow/flow Spotted light fawn to greenish gray Some recrystallized interpillow sediments Y Y 5R-3 2-4A 1 534.44 534.79 68-103 35 35 - 10 Moderately plagioclase megaphyric basalt Fine grained Pillow Spotted light fawn to greenish gray Some recrystallized interpillow sediments Y Y 5R-3 4B-6 - 534.79 534.91 103-115 12 47 12 11-1 Interflow material or sediment Fine to medium grained Sediment Grayish green/brown Interflow material or sediment N N 5R-3 6-9 1 534.91 535.26 115-150 35 47 35 11-2 Sparsely plagioclase-olivine microphyric basalt Fine grained Pillow Grayish green blackish rim Trace vesicles, 0.5 mm maximum size Y Y 5R-4 1-3B - 535.26 535.58 0-32 32 32 - 12 Highly calcified interpillow materials Fine-grained interpillow sediment Sediment Weak red, gray, green, orange Basalt fragments, hydrothermal precipitates, claystone and calcareous sediments N Y 5R-4 3C-9C 1 535.58 536.68 32-142 110 211 110 13-1 Moderately plagioclase-olivine phyric, aphyric basalt Fine grained Pillow/flow Light to fine-speckled gray - Y Y 5R-5 1A-6 3 536.68 537.69 0-101 101 211 101 13-1 Same as above Same as above Pillow/flow Same as above - Y Y 5R-5 6-9 - 537.69 537.98 101-130 29 211 29 13-2 Interpillow material and sediment Fine-grained interpillow sediment Sediment Olive green, brown Recrystallized interpillow sediments N N 5R-5 10 - 537.98 538.09 130-141 11 11 - 14 Aphyric basalt Fine grained Pillow Fine-speckled gray Base of unit contains void space that has been filled with carbonate Y N 6R-1 1-4 - 540.50 540.88 0-38 38 97 38 15-1 Basalt fragments, unverified ordering and orientation Fine grained Pillow Grays with greenish tinge - N N 6R-1 4-8 - 540.88 541.47 38-97 59 97 59 15-2 Basalt fragments, unverified ordering and orientation Fine grained Pillow/flow Grays with greenish tinge Small amount of interpillow material observed between Subunits 15-1 and 15-2 N N 6R-1 9-11 - 541.47 541.80 97-130 33 168 - 16 Sparsely plagioclase, olivine phyric, aphyric basalt Fine grained, sheet flow Flow Speckled gray, greenish gray Alteration of phenocrysts is banded, some layers altered white, others dark green Y Y 6R-2 1A-2F 2 541.80 543.15 0-135 135 168 - 16 Same as above Same as above Flow Same as above - Y Y 6R-2 2G - 543.15 543.30 135-150 15 15 - 17 Moderately olivine, plagioclase phyric basalt Fine grained Pillow Dark greenish gray and black Glassy rims on contacts, veins have black halos Y Y 6R-3 1 1 543.30 543.45 0-15 15 15 - 18 Moderately olivine, plagioclase phyric basalt Fine grained Pillow Greenish gray - Y N 6R-3 2-4 - 543.45 543.64 15-34 19 19 - 19 Aphyric basalt Fine grained Pillow Greenish gray 3-4 cm of altered interpillow sediments at top of unit Y N 6R-3 5-10 2 543.64 544.75 34-145 111 271 227 20-1 Moderately to sparsely olivine, plagioclase phyric patches Cryptocrystalline, sheet flow Flow Greenish gray to speckled gray Cr-rich basalt, 2% vesicles at base Y N 6R-4 1A-4 1 544.75 545.91 0-116 116 271 - 20-1 Same as above Same as above Flow Same as above - Y N 6R-4 4-5 - 545.91 546.12 116-137 21 271 65 20-2 Moderately-sparsely olivine-plagioclase phyric patches Cryptocrystalline, sheet flow Pillow/flow Greenish gray to speckled gray Cr-poor basalt, microcrystalline at top Y N 6R-5 1A-2 - 546.12 546.56 0-44 44 271 - 20-2 Same as above Same as above Pillow/flow Same as above - Y N 6R-5 3A-8 2 546.56 547.22 44-110 66 195 - 21 Aphyric basalt Fine grained, sheet flow Flow Medium gray <1% vesicles, rare pyrite, carbonate veinlets N N 7R-1 1-9B 3 550.10 551.39 0-129 129 195 - 21 Same as above Same as above Flow Same as above - N N 7R-1 10A-10B - 551.39 551.54 129-144 15 158 - 22 Aphyric basalt Fine grained, sheet flow Flow Medium gray 2% vesicles up to 0.5 mm N N 7R-2 1A-5 1 551.54 552.97 0-143 143 158 - 22 Same as above Same as above Flow Same as above - N N 7R-3 1A-6 4 552.97 554.42 0-145 145 381 - 23 Aphyric basalt Fine grained, sheet flow Flow Medium gray Hydrothermal breccia zone toward top of unit, up to 5% vesicles N Y 7R-4 1-12 2 554.42 555.92 0-150 150 381 - 23 Same as above Same as above Flow Same as above - N Y 7R-5 1-9 - 555.92 556.45 0-53 53 381 - 23 Same as above Same as above Flow Same as above - N Y 8R-1 1-4B 1 559.50 559.83 0-33 33 381 - 23 Same as above Same as above Flow Same as above - N Y 8R-1 5-7 1 559.83 560.30 33-80 47 220 47 24-1 Aphyric basalt Fine grained Pillow Gray to greenish gray Top portion of unit is brecciated, up to 2% vesicles Y Y 8R-1 7-8B 1 560.30 560.56 80-106 26 220 26 24-2 Aphyric basalt Fine grained Pillow Gray to greenish gray Interpillow material observed between Subunits 24-1 and 24-2 Y Y 8R-2 1A-18 5 560.56 561.98 0-142 142 220 173 24-3 Aphyric basalt Fine grained Flow Gray to greenish gray - Y Y 9R-1 1A-3 - 563.20 563.51 0-31 31 220 173 24-3 Same as above Same as above Flow Same as above - Y Y 9R-1 4-8D 1 563.51 564.60 31-140 109 1352 - 25 Aphyric, patches of sparsely plagioclase phyric basalt Fine grained Flow Gray with dark green spots Concentration of pyrite near top margin as vein infilling and replacement material Y Y 9R-2 1A-1L 2 564.60 565.94 0-134 134 1352 - 25 Same as above Same as above Flow Same as above - Y Y 9R-3 1A-1M 2 565.94 567.20 0-126 126 1352 - 25 Same as above Same as above Flow Same as above - Y Y 9R-4 1A-1G 1 567.20 568.60 0-140 140 1352 - 25 Same as above Same as above Flow Same as above - Y Y 9R-5 1A-1E 2 568.60 569.10 0-50 50 1352 - 25 Same as above Same as above Flow Same as above - Y Y 10R-1 1A-1U 1 569.00 570.47 0-147 147 1352 - 25 Same as above Same as above Flow Same as above - Y Y 10R-2 1A-2O 3 570.47 571.87 0-140 140 1352 - 25 Same as above Same as above Flow Same as above - Y Y 10R-3 1A-4A - 571.87 573.37 0-150 150 1352 - 25 Same as above Same as above Flow Same as above - Y Y 10R-4 1A-2O 1 573.37 574.84 0-147 147 1352 - 25 Same as above Same as above Flow Same as above - Y Y 10R-5 1A-2I 3 574.84 576.18 0-134 134 1352 - 25 Same as above Same as above Flow Same as above - Y Y 10R-6 1A-2 3 576.18 576.93 0-75 75 1352 - 25 Same as above Same as above Flow Same as above - Y Y 10R-6 3A-3E 1 576.93 577.52 75-134 59 76 - 26 Moderately olivine, plagioclase microphyric basalt Microcrystalline to fine grained Pillow/flow Medium to dark gray 5-10% veins and fractures infilled with carbonate and smectite Y N 11R-1 1A-1E - 577.90 578.07 0-17 17 76 - 26 Same as above Same as above Pillow/flow Same as above - Y N 11R-1 1F-4D 2 578.07 579.29 17-139 122 247 - 27 Sparsely plagioclase, olivine microphyric basalt Cryptocrystalline Flow Dark gray to gray Veins have well-developed halos containing disseminated fine pyrite Y Y 11R-2 1A-8 1 579.29 580.54 0-125 125 247 - 27 Same as above Same as above Flow Same as above - Y Y 11R-2 9A-9B 1 580.54 580.79 125-150 25 84 - 28 Aphyric basalt Hypocrystalline Pillow/flow Dark gray Bottom contact is a carbonate veinlet with green clay and pyrite Y N 11R-3 1A-1D 1 580.79 581.38 0-59 59 84 - 28 Same as above Same as above Pillow/flow Same as above - Y N 11R-3 2A-9 2 581.38 582.29 59-150 91 106 - 29 Aphyric basalt Hypocrystalline fine grained Flow Dark gray to blackish Veins have well-developed halos containing clays and pyrite Y Y 11R-4 1 - 582.29 582.38 0-9 9 106 - 29 Same as above Same as above Flow Same as above - Y Y 12R-1 1A-1B - 587.30 587.36 0-6 6 106 - 29 Same as above Same as above Flow Same as above - Y Y 12R-1 2-9A 1 587.36 587.79 6-49 43 43 - 30 Aphyric basalt Cryptocrystalline Pillow Dark gray Top 12 cm interpillow carbonate and clay sediments present Y Y 12R-1 9B-23 1 587.79 588.80 49-150 101 101 - 31 Moderately olivine, plagioclase microphyric basalt Cryptocrystalline fine grained Flow Dark gray Y Y 12R-2 1A-11B 2 588.80 590.24 0-144 144 236 - 32 Aphyric basalt Hypocrystalline fine grained Flow Medium gray N N 12R-3 1A-5B 3 590.24 591.16 0-92 92 236 - 32 Same as above Same as above Flow Same as above - N N 185-801C- 13R-1 1-8 - 594.30 594.77 0-47 47 47 - 33 Rubble unit, mixed debris from overlying section Rubble Rubble unit, debris from overlying section that dropped into the hole N N 14R-1 1-2 XRF, PP, TSB 604.00 605.30 0-130 130 221 - 34 Aphyric basalt Fine grained, single flow Flow Gray to dark gray This unit is similar to 129-801C-12R-3 (Unit 32) above N Y 14R-2 1 PP 605.30 606.21 0-91 91 221 - 34 Aphyric basalt Fine grained, single flow Flow Gray to dark gray - N Y 14R-2 2A-2C PP, TSB*2 606.21 606.55 91-125 34 34 - 35 Aphyric basalt Fine grained, pillow with interpillow sediment Pillow Very dark gray, green brown, red Pillow margins are altered glass, irregular curved margin 14R-2, 112 cm N Y 14R-2 3-7 TSB 606.55 606.76 125-146 21 27 - 36 Cherty interpillow sediments Fine grained and banded Sediment Dark brown, yellow, green Bedding observed perpendicular to color banding, contains radiolarians N N 14R-3 1-2 - 606.76 606.82 0-6 6 27 - 36 Cherty interpillow sediments Fine grained and banded Sediment Dark brown, yellow, green - N N 14R-3 3 - 606.82 607.04 6-28 22 158 22 37-1 Aphyric basalt Fine grained, pillow with interpillow sediment Pillow Very dark gray, interpillow green yellow, red MST log results suggest high K and low magnetic susceptibility in interpillow zones N N 14R-3 4-5B PP 607.04 607.23 28-47 19 - 19 37-2 Aphyric basalt Fine-grained pillow or maybe thin flow Pillow Very dark gray - Y Y 14R-3 6-8B - 607.23 607.46 47-70 23 - 23 37-3 Aphyric basalt Fine-grained pillow or maybe thin flow Pillow Very dark gray - Y Y 14R-3 8C-8D - 607.46 607.66 70-90 20 - 20 37-4 Aphyric basalt Fine-grained pillow or maybe thin flow Pillow Very dark gray - Y Y 14R-3 8D-10 XRF, PP, TSB 607.66 608.02 90-126 36 - 36 37-5 Aphyric basalt Fine grained, small pillows and interpillow material Pillow Very dark gray Curved chilled pillow margins Y Y 14R-3 11-12 - 608.02 608.13 126-137 11 - 11 37-6 Aphyric basalt Fine grained Pillow Very dark gray - N N 14R-4 1A-3 PP 608.13 608.40 0-27 27 - 27 37-7 Aphyric basalt Fine grained Pillow Very dark gray - Y N 14R-4 4-10 XRF 608.40 609.08 27-95 68 213 68 38-1 Aphyric basalt Fine grained, varying grain size Pillow/flow Very dark gray to gray MST log shows differences in K and magnetic susceptibility between sections 4 and 5 N N 14R-4 11-15 - 609.08 609.58 95-145 50 - 50 38-2 Aphyric basalt Fine margins, coarser center Pillow/flow Gray - Y N 14R-5 1A-2A - 609.58 609.79 0-21 21 - 21 38-3 Aphyric basalt Fine grained Pillow Dark gray No contact observed N N 14R-5 3A-4A PP 609.79 610.14 21-56 35 - 35 38-4 Aphyric basalt Fine grained Pillow Dark gray - Y N 14R-5 5-8A - 610.14 610.53 56-95 39 - 39 38-5 Aphyric basalt Fine grained Pillow Dark gray No contact observed N N 15R-1 1A-6 PP, TSB*2 613.70 614.13 0-43 43 43 - 39 Aphyric basalt Fine grained, varying grain size, pillows and interpillow breccia Breccia Pale gray to green, white brown, red Highly variable color, interpillow fill mostly green and white Y Y 15R-1 7-14 PP, TSB 614.13 614.50 43-80 37 37 - 40 Interpillow material and sediment (black chert) Sometimes brecciated sedimentary fill material Sediment Reddish strong brown, green Red zone of sedimentation between flows/pillows N N 15R-1 15-16B - 614.50 614.75 80-105 25 107 25 41-1 Aphyric basalt Fine grained, varying grain size, pillows and interpillow breccia Breccia Green to dark gray, white brown, red Highly variable, fill is red and white, red is similar to overlying fill unit Y Y 15R-1 17A-18 - 614.75 615.02 105-132 27 - 27 41-2 Aphyric basalt Fine grained Pillow Dark gray - Y N 15R-2 1A-1D PP*2 615.02 615.43 0-41 41 - 41 41-3 Aphyric basalt Fine grained Pillow Dark gray - N Y 15R-2 2 - 615.43 615.57 41-55 14 - 14 41-4 Aphyric basalt Fine grained Pillow Dark gray - Y Y 15R-2 3-4 TSB 615.57 615.64 55-62 7 39 7 42-1 Chert, aphyric basalt and interpillow material Fine grained, polymict interpillow sediments and breccia Sediment Greenish gray, brown, red Fill material red and yellow, similar to above N N 15R-2 5-7A - 615.64 615.96 62-94 32 - 32 42-2 Aphyric basalt Fine grained, varying grain size, pillows and interpillow breccia Breccia Greenish gray - N Y 15R-2 7A-7B - 615.96 616.27 94-125 31 174 31 43-1 Aphyric basalt Fine grained, varying grain size, pillows and interpillow breccia Breccia Dark green gray, green and red Curved or irregular chilled margins to the pillows Y Y 15R-2 7B-7C - 616.27 616.38 125-136 11 - 11 43-2 Aphyric basalt Fine grained Pillow Dark gray to greenish gray - Y Y 15R-3 1A - 616.38 616.49 0-11 11 - 11 43-3 Aphyric basalt Fine grained Pillow Dark gray to greenish gray - N Y 15R-3 1A - 616.49 616.60 11-22 11 - 11 43-4 Aphyric basalt Fine grained Pillow Dark gray to greenish gray - Y Y 15R-3 1A-1B PP 616.60 616.92 22-54 32 - 32 43-5 Aphyric basalt Fine grained Pillow Dark gray to greenish gray - Y Y 15R-3 1B-2 - 616.92 617.10 54-72 18 - 18 43-6 Aphyric basalt Fine grained Pillow Dark gray to greenish gray Curved or irregular chilled margins to the pillows Y Y 15R-3 2-3B - 617.10 617.51 72-113 41 - 41 43-7 Aphyric basalt Fine grained Pillow Dark gray to greenish gray - Y N 15R-3 3C-5 PP, TSB 617.51 617.68 113-130 17 - 19 43-8 Aphyric basalt Medium-grained interpillow material Sediment Gray and brownish red - N N 15R-4 1 - 617.68 617.70 0-2 2 - 19 43-8 Aphyric basalt Medium-grained interpillow material Sediment Gray and brownish red - N N 15R-4 1 XRF, PP, TSB 617.70 619.00 2-132 130 225 - 44 Aphyric basalt with small vesicles Fine-grained single flow Flow Gray Red interflow material at the bottom margin 15R-4, 91-97 cm Y Y 15R-5 1A PP 619.00 619.95 0-95 95 225 - 44 Aphyric basalt with small vesicles Fine-grained single flow Flow Gray - Y Y 15R-6 1A-1C PP 619.95 621.07 0-112 112 112 - 45 Aphyric to plagioclase, clino- pyroxene phyric basalt at base Fine-grained single flow Flow Dark gray Red interpillow material and basalt chunk at the top of flow 15R-6, 0-3 cm Y Y 15R-6 1C-1E - 621.07 621.20 112-125 13 138 13 46-1 Aphyric basalt with interpillow material Fine grained, small pillows and breccia Breccia Greenish dark gray, brown red - Y Y 15R-6 1E-1G - 621.20 621.35 125-140 15 - 60 46-2 Aphyric basalt Fine grained Pillow/flow Dark gray - Y Y 15R-7 1A-1B PP 621.35 621.80 0-45 45 - 60 46-2 Aphyric basalt Fine grained Pillow/flow Dark gray - Y Y 15R-7 1C-1D PP 621.80 621.98 45-63 18 - 18 46-3 Interpillow material Medium-grained interpillow material Sediment Brownish red - N N 15R-7 1E-1F XRF, TSB*2 621.98 622.45 63-110 47 - 47 46-4 Aphyric basalt Fine grained Pillow Dark gray - Y N 16R-1 1-2F - 623.30 623.57 0-27 27 270 27 47-1 Aphyric basalt to sparsely plagioclase phyric Fine grained microcrystalline Pillow Gray to pale green at base N Y 16R-1 2F-3 - 623.57 623.67 27-37 10 - 10 47-2 Aphyric basalt Fine-grained interpillow breccia with pillows Breccia Gray green - N N 16R-1 3-4G XRF, PP, TSB 623.67 624.74 37-144 107 - 111 47-3 Aphyric basalt Fine grained Flow Gray - Y Y 16R-2 1A - 624.74 624.78 0-4 4 - 111 47-3 Aphyric basalt Fine grained Flow Gray - Y Y 16R-2 1A-1B - 624.78 625.14 4-40 36 - 36 47-4 Aphyric basalt Fine-grained interpillow breccia with pillows Breccia Gray green Pale green altered small pillows and breccia N N 16R-2 1B-1D PP, TSB 625.14 625.86 40-112 72 - 72 47-5 Aphyric basalt Fine grained Pillow/flow Pale green, grayish green - Y Y 16R-2 1E-1F - 625.86 626.00 112-126 14 - 14 47-6 Interflow sediment Medium-grained granular recrystallized sediments Sediment Olive green to red brown Recrystallized sediment N N 16R-2 1F - 626.00 626.03 126-129 3 46 - 48 Hydrothermal deposit Medium grained Hydrothermal Olive yellow to olive brown Silicified yellow brown breccia, chemical Fe-Si deposit N N 16R-3 1-4 PP, TSB 626.03 626.46 0-43 43 46 - 48 Hydrothermal deposit Medium grained Hydrothermal Olive yellow to olive brown - N N 16R-3 5 XRF, TSB 626.46 626.67 43-64 21 817 21 49-1 Interflow sediment Medium-grained granular recrystallized sediments Sediment Olive green to red brown Recrystallized sediment N N 16R-3 6A-6B PP 626.67 626.93 64-90 26 - 26 49-2 Aphyric basalt Fine grained Pillow Greenish gray - Y Y 16R-3 7A-8B - 626.93 627.44 90-141 51 - 198 49-3 Aphyric basalt Fine grained Flow Dark gray - Y Y 16R-4 1A-9 XRF, PP*2, TSB 627.44 628.91 0-147 147 - 198 49-3 Aphyric basalt Fine grained Flow Dark gray - Y Y 16R-5 1A-2A - 628.91 629.06 0-15 15 - 15 49-4 Interflow sediment Medium-grained interpillow material Sediment Green and white Rubble pieces and recrystallized interpillow sediment, olive green and red brown N N 16R-5 3A-6B PP 629.06 629.47 15-56 41 - 41 49-5 Aphyric basalt Fine grained Pillow Dark gray - Y N 16R-5 7A-15 TSB 629.47 630.20 56-129 73 - 118 49-6 Pillows and interflow sediment Medium grained Breccia Red and white basalt breccia Small pillows with vugs and interpillow fill, carbonate and red chert N N 17R-1 1-7A TSB 632.80 633.25 0-45 45 - 118 49-6 Pillows and interpillow sediment Medium grained Sediment Red and white basalt breccia Small pillows, rims and basalt clasts with recrystallized red and white interpillow material N N 17R-1 7A-9B XRF, PP, TSB 633.25 634.29 45-149 104 - 104 49-7 Aphyric basalt Fine grained Flow Dark gray - Y Y 17R-2 1-5 - 634.29 634.64 0-35 35 - 35 49-8 Aphyric basalt Fine grained Pillow Very dark gray - Y N 17R-2 6-9 - 634.64 635.30 35-101 66 - 66 49-9 Aphyric basalt Fine grained Pillow/flow Very dark gray - Y N 17R-2 10-12 - 635.30 635.69 101-140 39 - 39 49-10 Aphyric basalt Fine grained Pillow Very dark gray - Y N 17R-2 13 - 635.69 635.78 140-149 9 - 96 49-11 Aphyric basalt Fine grained Pillow/flow Very dark gray - Y N 17R-3 1-5 PP 635.78 636.65 0-87 87 - 96 49-11 Aphyric basalt Fine grained Pillow/flow Very dark gray - Y N 17R-3 6-9 XRF, TSB 636.65 636.95 87-117 30 - 30 49-12 Aphyric basalt Fine grained Pillow Very dark gray - Y N 17R-3 10 PP 636.95 637.15 117-137 20 - 20 49-13 Aphyric basalt Fine grained Pillow Very dark gray - Y Y 17R-3 10 - 637.15 637.23 137-145 8 - 8 49-14 Interpillow sediment Variable grain size, granular appearance Sediment Green and white Interpillow material, both contacts with basalt are observed N N 17R-4 1 - 637.23 637.28 0-5 5 4308 5 50-1 Cherty interpillow sediments Variable grain size Sediment Dark gray to green Single piece of cherty sediment N N 17R-4 2-4B - 637.28 637.70 5-47 42 - 42 50-2 Aphyric basalt Fine grained, very thin lows and interflow breccia Breccia Very dark gray and dark green Seven chills, some are exceptionally straight dark green interpillow material Y Y 17R-4 4B-5A - 637.70 637.90 47-67 20 - 20 50-3 Aphyric basalt Fine grained Pillow Gray to dark gray - Y Y 17R-4 5B - 637.90 638.08 67-85 18 - 18 50-4 Aphyric basalt Fine grained Pillow Gray to dark gray - Y Y 17R-4 6-9 PP 638.08 638.63 85-140 55 - 90 50-5 Aphyric basalt Fine grained Pillow/flow Gray to dark gray Brecciated flow top N Y 17R-5 1-4 - 638.63 638.98 0-35 35 - 90 50-5 Aphyric basalt Fine grained Pillow/flow Gray to dark gray - N Y 18R-1 1-5 - 642.20 642.51 0-31 31 - 31 50-6 Aphyric basalt Fine grained Pillow Gray to dark gray - Y Y 18R-1 6-9 - 642.51 642.70 31-50 19 - 19 50-7 Aphyric basalt Fine grained Pillow Gray to dark gray - Y Y 18R-1 10-11 XRF, PP, TSB 642.70 643.24 50-104 54 - 54 50-8 Aphyric basalt Fine grained Pillow/flow Gray to dark gray - Y Y 18R-1 12-14 - 643.24 643.34 104-114 10 - 10 50-9 Volcaniclastic breccia Variable grain size Pillow Gray, green and white - N N 18R-1 15-18 - 643.34 643.70 114-150 36 - 108 50-10 Aphyric basalt Fine grained Flow Dark gray Glass on several pieces Y Y 18R-2 1-6 PP 643.70 644.42 0-72 72 - 108 50-10 Aphyric basalt Fine grained Flow Dark gray - Y Y 18R-2 6-7 XRF 644.42 644.85 72-115 43 - 43 50-11 Aphyric basalt Fine grained, thin flow or pillow Pillow Gray to dark gray - Y Y 18R-2 8-10 - 644.85 645.04 115-134 19 - 19 50-12 Aphyric basalt Fine grained, thin flow or pillow Pillow Gray to dark gray - Y Y 18R-2 11-13 - 645.04 645.19 134-149 15 - 39 50-13 Aphyric basalt Fine grained, thin flow or pillow Pillow Gray to dark gray Small fragments, no chills N N 18R-3 1-4 - 645.19 645.43 0-24 24 - 39 50-13 Aphyric basalt Fine grained, thin flow or pillow Pillow Gray to dark gray - N N 19R-1 1-4 PP 651.70 652.56 0-86 86 - 86 50-14 Aphyric basalt Fine grained, thin flow or pillow Pillow/flow Gray to dark gray - N Y 19R-1 5-13 - 652.56 653.20 86-150 64 - 64 50-15 Aphyric basalt Fine grained, thin flow or pillow Pillow/flow Gray to dark gray - N Y 19R-2 1-4 - 653.20 653.48 0-28 28 - 28 50-16 Volcaniclastic breccia Fine grained, thin flow or pillow Pillow Black, green, and white - N N 19R-2 5-7 - 653.48 653.91 28-71 43 - 43 50-17 Aphyric basalt Fine grained, thin flow or pillow Pillow Gray to dark gray - N Y 19R-2 8-10 - 653.91 654.39 71-119 48 - 89 50-18 Aphyric basalt Fine grained, thin flow or pillow Pillow/flow Gray to dark gray - Y Y 19R-3 1 XRF, PP, TSB 654.39 654.80 0-41 41 - 89 50-18 Aphyric basalt Fine grained, thin flow or pillow Pillow/flow Gray to dark gray - Y Y 19R-3 2-5 - 654.80 655.26 41-87 46 - 46 50-19 Aphyric basalt Fine grained, thin flow or pillow Pillow Gray to dark gray Small fragments, no chills N N 20R-1 1-5 - 660.70 660.88 0-18 18 - 18 50-20 Aphyric basalt Fine grained, thin flow or pillow Pillow Gray to dark gray - Y Y 20R-1 6-7C PP 660.88 661.37 18-67 49 - 49 50-21 Aphyric basalt Fine grained, thin flow or pillow Pillow Gray to dark gray Thick vein at base of unit Y Y 20R-1 8-11 - 661.37 661.74 67-104 37 - 37 50-22 Aphyric basalt Fine grained, thin flow or pillow Pillow Gray to dark gray - N Y 20R-1 12-17 - 661.74 662.11 104-141 37 - 37 50-23 Aphyric basalt Fine grained, thin flow or pillow Pillow Gray to dark gray - Y Y 20R-2 1 XRF, PP 662.11 663.18 0-107 107 - 107 50-24 Aphyric basalt Fine grained, thin flow or pillow Flow Gray to dark gray - Y Y 20R-2 2-10 - 663.18 663.59 107-148 41 - 90 50-25 Aphyric basalt Fine grained, small pillows and breccia Breccia Gray to dark gray Glassy pillow rims and interpillow material, brecciated pillow fragments Y Y 20R-3 1-7 TSB 663.59 664.08 0-49 49 - 90 50-25 Aphyric basalt Fine grained, small pillows and breccia Pillow Gray to dark gray Various glassy chills, basalt and breccia fragments, rubbly section Y Y 21R-1 1-6E XRF, PP, TSB 670.00 671.41 0-141 141 - 210 50-26 Aphyric basalt Fine grained, flow or thick pillow Flow Dark gray More massive unit, some olivine present with plagioclase Y N 21R-2 1-5 - 671.41 672.10 0-69 69 - 210 50-26 Aphyric basalt Fine grained, flow or thick pillow Flow Dark gray - Y N 21R-2 6 PP, TSB 672.10 672.63 69-122 53 - 129 50-27 Aphyric basalt Fine grained, flow or thick pillow Flow Dark gray 5 cm breccia/sediment at top Y Y 21R-3 1 PP 672.63 673.39 0-76 76 - 129 50-27 Aphyric basalt Fine grained, flow or thick pillow Flow Dark gray >100% recovery so there is a 13-cm overlap on depth calculation in 21R Y Y 21R-3 2-8 TSB 673.39 673.73 76-110 34 - 34 50-28 Aphyric basalt and interpillow material Fine grained, pillows/basalt breccia and interpillow stuff Breccia Dark gray, green and white Small pillows and basalt clasts with recrystallized white interpillow material N N 22R-1 1-3 PP 673.60 673.99 0-39 39 - 39 50-29 Aphyric basalt Fine-grained thin flow or pillow Pillow Dark gray Top 10 cm is hydrothermal deposit rubble from above N Y 22R-1 4A TSB 673.99 674.06 39-46 7 - 7 50-30 Interflow recrystallized sediment pale colored Medium grained, granular appearance Sediment Yellow green and white Chilled contacts to units above and below suggest it is recrystallized interflow sediment N N 22R-1 4B-4C - 674.06 674.26 46-66 20 - 20 50-31 Aphyric basalt Fine-grained thin flow or pillow Pillow Dark gray - Y Y 22R-1 4D-4F - 674.26 674.43 66-83 17 - 17 50-32 Aphyric basalt Fine-grained thin flow or pillow Pillow Dark gray - Y Y 22R-1 4F-4G - 674.43 674.54 83-94 11 - 11 50-33 Aphyric basalt Fine-grained thin flow or pillow Pillow Dark gray - Y Y 22R-1 4G-5 - 674.54 674.66 94-106 12 - 12 50-34 Aphyric basalt Fine-grained thin flow or pillow Pillow Dark gray - Y Y 22R-1 6 - 674.66 674.70 106-110 4 - 4 50-35 Interflow recrystallized sediments layered and greenish brown Medium grained, banded Sediment Greenish brown to olive green Occurs as an individual piece, no contacts, may originally have been more N N 22R-1 7 PP 674.70 674.81 110-121 11 - 11 50-36 Aphyric basalt Fine-grained thin flow or pillow Pillow Dark gray - N Y 22R-1 8 - 674.81 674.84 121-124 3 - 21 50-37 Aphyric basalt Fine-grained thin flow or pillow Pillow Dark gray Top 4 cm is interflow sediment, like that observed in Subunit 50-30 Y Y 22R-2 1A-1B - 674.84 675.02 0-18 18 - 21 50-37 Aphyric basalt Fine-grained thin flow or pillow Pillow Dark gray Rubble and glass at the base of the unit Y Y 22R-2 1B TSB 675.02 675.07 18-23 5 - 5 50-38 Interflow recrystallized sediment pale colored Medium grained, granular Sediment Olive green and white Chilled contacts to units above and below suggest it is recrystallized interflow sediment N N 22R-2 1B-4 XRF, PP*2 675.07 676.33 23-149 126 - 126 50-39 Aphyric basalt Fine margins medium center of thicker flow Flow Gray to dark gray Glassy margins Y Y 22R-3 1-3 - 676.33 676.63 0-30 30 - 30 50-40 Aphyric basalt Fine-grained thin flow or pillow Pillow Gray to dark gray - Y Y 22R-3 4A-11 - 676.63 677.55 30-122 92 - 92 50-41 Aphyric basalt Fine margins, medium center, thicker flow Pillow/flow Gray to dark gray - N Y 23R-1 1-2 - 681.90 682.00 0-10 10 - 10 50-42 Aphyric basalt Fine-grained thin flow or pillow Pillow Gray to dark gray - N Y 23R-1 2-7 - 682.00 682.90 10-100 90 - 90 50-43 Aphyric basalt Fine margins, medium center, thicker flow Pillow/flow Gray to dark gray - Y Y 23R-1 7-10 TSB 682.90 683.16 100-126 26 - 92 50-44 Aphyric basalt Fine margins, medium center, thicker flow Pillow/flow Gray to dark gray - Y Y 23R-2 1-4 PP 683.16 683.82 0-66 66 - 92 50-44 Aphyric basalt Fine margins, medium center, thicker flow Pillow/flow Gray to dark gray - Y Y 23R-2 4-12 - 683.82 684.58 66-142 76 - 131 50-45 Aphyric basalt Fine margins, medium center, thicker flow Flow Gray to dark gray - Y Y 23R-3 1-4 PP 684.58 685.13 0-55 55 - 131 50-45 Aphyric basalt Fine margins, medium center, thicker flow Flow Gray to dark gray - Y Y 23R-3 5-7 - 685.13 685.48 55-90 35 - 35 50-46 Aphyric basalt Fine margins, medium center, flow or larger pillow Pillow Gray to dark gray - Y Y 23R-3 8-12 - 685.48 685.98 90-140 50 - 50 50-47 Aphyric basalt Fine margins, medium center, flow or larger pillow Pillow Gray to dark gray - Y Y 23R-4 1-4 XRF, PP 685.98 686.78 0-80 80 - 80 50-48 Aphyric basalt Fine margins, medium center, flow or larger pillow Pillow/flow Gray to dark gray - Y Y 23R-4 5-6 - 686.78 686.96 80-98 18 - 18 50-49 Aphyric basalt Fine margins, medium center Pillow Gray to dark gray - Y Y 24R-1 1-2 - 691.30 691.52 0-22 22 - 22 50-50 Aphyric basalt Fine margins, medium center Pillow Gray to dark gray - Y Y 24R-1 3-10 PP 691.52 692.27 22-97 75 - 75 50-51 Aphyric basalt Fine margins, medium center Pillow/flow Gray to dark gray - Y Y 24R-1 11-12 XRF, TSB*2 692.27 692.44 97-114 17 - 17 50-52 Aphyric basalt Thin microcrystalline unit Pillow Dark gray Recrystallized interpillow material at the base of this thin subunit Y Y 24R-1 13-14 - 692.44 692.63 114-133 19 - 19 50-53 Aphyric basalt Thin microcrystalline unit Pillow Dark gray Recrystallized interpillow material at the top of this thin subunit Y N 24R-2 1 - 692.63 692.87 0-24 24 - 24 50-54 Aphyric basalt Thin microcrystalline unit Pillow Dark gray - Y Y 24R-2 2 PP 692.87 693.47 24-84 60 - 60 50-55 Aphyric basalt Fine margins, medium center Pillow/flow Dark gray - Y Y 24R-2 3-10 XRF, PP 693.47 693.88 84-125 41 - 41 50-56 Rubbly brecciated pillow, dark cement Fine-grained and glassy pillow breccia Breccia Dark to very dark gray or black Various glassy fragments, chilled pillow rims and fragmented basalt breccia Y Y 24R-2 11-15 - 693.88 694.13 125-150 25 - 91 50-57 Aphyric basalt Fine margins, medium center Pillow/flow Dark gray 2-3 cm of interpillow material at base of unit Y Y 24R-3 1-5 PP, TSB 694.13 694.79 0-66 66 - 91 50-57 Aphyric basalt Fine margins, medium center Pillow/flow Dark gray - Y Y 24R-3 6A-9 - 694.79 695.09 66-96 30 - 30 50-58 Aphyric basalt Fine grained Pillow Dark gray - Y Y 24R-3 10-14 - 695.09 695.53 96-140 44 - 44 50-59 Aphyric basalt Fine grained Pillow Dark gray - N N 25R-1 1A-6 - 700.70 701.20 0-50 50 - 50 50-60 Aphyric basalt Fine grained Pillow Dark gray - Y N 25R-1 7A-11 PP 701.20 701.82 50-112 62 - 62 50-61 Aphyric basalt Fine grained Pillow/flow Dark gray - N N 25R-1 12-15 XRF 701.82 702.16 112-146 34 - 34 50-62 Aphyric basalt Fine grained Pillow Dark gray - Y N 26R-1 1-4A PP, TSB 710.20 710.50 0-30 30 - 30 50-63 Aphyric basalt breccia and green recrystallized interflow material Fine grained, thin 4-10 cm flows and basalt clasts Breccia Dark gray, dark green and white Basalt and recrystallized interflow material, saponite, celadonite, and carbonate Y Y 26R-1 4B-5 - 710.50 710.88 30-68 38 - 38 50-64 Aphyric basalt Fine-grained sheet flow Pillow Dark gray - Y N 26R-1 6-12 XRF, PP, TSB 710.88 711.52 68-132 64 - 103 50-65 Aphyric basalt Fine-grained sheet flow Flow Dark gray - Y Y 26R-2 1-2 - 711.52 711.91 0-39 39 - 103 50-65 Aphyric basalt Fine-grained sheet flow Flow Dark gray - Y Y 26R-2 3-11 PP 711.91 712.82 39-130 91 - 91 50-66 Aphyric basalt Fine-grained sheet flow Pillow/flow Dark gray - N Y 27R-1 1-3 - 719.70 720.20 0-50 50 - 50 50-67 Aphyric basalt Fine-grained sheet flow Pillow Dark gray - N Y 27R-1 4-7 PP 720.20 720.96 50-126 76 - 76 50-68 Aphyric basalt Fine-grained sheet flow Pillow/flow Dark gray Top 5 cm and bottom 2 cm are brecciated interflow material Y Y 27R-2 1-6 XRF, PP 720.96 722.45 0-149 149 - 149 50-69 Aphyric basalt Fine-grained sheet flow Flow Dark gray Brecciated base (bottom 10 cm) N Y 27R-3 1-4 TSB 722.45 722.65 0-20 20 - 20 50-70 Interflow material and hyaloclastite breccia Fine-grained interpillow recrystallized sediments Sediment Dark gray Various glassy rims, some hyaloclastite and recrystallized interflow material Y Y 27R-3 5-9 PP 722.65 723.75 20-130 110 - 447 50-71 Aphyric basalt Fine margins, medium center, thick massive sheet flow Flow Gray Top 30-40 cm is brecciated Y Y 27R-4 1 PP 723.75 725.17 0-142 142 - 447 50-71 Aphyric basalt Fine margins, medium center, thick massive sheet flow Flow Gray - Y Y 27R-5 1-8 XRF, TSB 725.17 726.07 0-90 90 - 447 50-71 Aphyric basalt Fine margins, medium center, thick massive sheet flow Flow Gray - Y Y 28R-1 1A-3 PP 728.70 729.75 0-105 105 - 447 50-71 Aphyric basalt Fine margins, medium center, thick massive sheet flow Flow Gray - Y Y 28R-1 4-7 - 729.75 730.04 105-134 29 - 95 50-72 Aphyric basalt Fine margins, medium center, sheet flow Pillow/flow Gray Brecciated flow top and base Y Y 28R-2 1A-1C XRF, PP 730.04 730.70 0-66 66 - 95 50-72 Aphyric basalt Fine margins, medium center, sheet flow Pillow/flow Gray - Y Y 28R-2 1C-8 - 730.70 731.19 66-115 49 - 49 50-73 Interpillow basalt breccia, glassy in places Fine-grained interflow breccia, carbonate cement Breccia Dark gray Various glassy fragments, chilled pillow rims, and fragmented basalt breccia Y Y 28R-2 9-10 - 731.19 731.54 115-150 35 - 72 50-74 Aphyric basalt Fine rims, medium-grained center, sheet flow Pillow/flow Dark gray Brecciated flow top and base Y Y 28R-3 1 - 731.54 731.91 0-37 37 - 72 50-74 Aphyric basalt Fine rims, medium-grained center, sheet flow Pillow/flow Dark gray - Y Y 28R-3 2-5 - 731.91 732.21 37-67 30 - 30 50-75 Glassy hyaloclastite breccia Fine-grained breccia, hyaloclastite fragments Hyaloclastite Dark gray, silver alteration Fresh glass and 0.5- to 4-cm shards, fragments of pillow edges Y Y 28R-3 6-9 - 732.21 732.44 67-90 23 - 23 50-76 Aphyric basalt Fine-grained sheet flow Pillow Gray to dark gray - Y Y 28R-3 10-16 PP 732.44 733.04 90-150 60 1943 60 51-1 Sparsely olivine phyric basalt Fine- to medium-grained sheet flow Pillow/flow Gray More massive unit, coarser, and contains many small vesicles N N 29R-1 1-2 XRF 737.90 738.20 0-30 30 - 700 51-2 Sparsely olivine phyric basalt Medium grained, thick massive flow Flow Gray More massive unit, coarser, and contains many vesicles varying in size to 2 mm N N 29R-1 3-14 PP 738.20 739.35 30-145 115 - 700 51-2 Sparsely olivine phyric basalt Medium grained, thick massive flow Flow Gray - N N 29R-2 1-5 - 739.35 739.90 0-55 55 - 700 51-2 Sparsely olivine phyric basalt Medium grained, thick massive flow Flow Gray - N N 30R-1 1-2 PP 747.30 748.79 0-149 149 - 700 51-2 Sparsely olivine phyric basalt Medium grained, thick massive flow Flow Gray - N N 30R-2 1-3 XRF, PP, TSB 748.79 750.20 0-141 141 - 700 51-2 Sparsely olivine phyric basalt Medium grained, thick massive flow Flow Gray - N N 30R-3 1-6 PP 750.20 751.52 0-132 132 - 700 51-2 Sparsely olivine phyric basalt Medium grained, thick massive flow Flow Gray - N N 30R-4 1-4 PP 751.52 752.30 0-78 78 - 700 51-2 Sparsely olivine phyric basalt Medium grained, thick massive flow Flow Gray - N N 30R-5 1A-3A PP, TSB 752.30 753.24 0-94 94 - 94 51-3 Sparsely olivine phyric basalt Medium grained, thick massive flow Pillow/flow Gray More massive unit, coarser, and contains many small vesicles N Y 30R-5 4A-5A TSB 753.24 753.57 94-127 33 - 33 51-4 Sparsely olivine phyric basalt Medium-grained sheet flow Pillow Gray Contains many small vesicles Y Y 30R-5 6A-7A - 753.57 753.77 127-147 20 - 121 51-5 Sparsely olivine phyric basalt Medium-grained sheet flow Flow Gray Contains many small vesicles N N 30R-6 1-6 - 753.77 754.22 0-45 45 - 121 51-5 Sparsely olivine phyric basalt Medium-grained sheet flow Flow Gray - N N 31R-1 1-8 PP 756.60 757.16 0-56 56 - 121 51-5 Sparsely olivine phyric basalt Medium-grained sheet flow Flow Gray - N N 31R-1 9A-10C - 757.16 757.89 56-129 73 - 935 51-6 Sparsely olivine phyric basalt Medium grained, thick massive flow Flow Gray Thick continuous subunit, good recovery and slow drilling rate in 31R N Y 31R-2 1-3B PP 757.89 759.15 0-126 126 - 935 51-6 Sparsely olivine phyric basalt Medium grained, thick massive flow Flow Gray - N Y 31R-3 1A-7 XRF, PP, TSB 759.15 760.55 0-140 140 - 935 51-6 Sparsely olivine phyric basalt Medium grained, thick massive flow Flow Gray - N Y 31R-4 1A-3F PP 760.55 762.00 0-145 145 - 935 51-6 Sparsely olivine phyric basalt Medium grained, thick massive flow Flow Gray - N Y 31R-5 1A-2I PP, TSB 762.00 763.32 0-132 132 - 935 51-6 Sparsely olivine phyric basalt Medium grained, thick massive flow Flow Gray Coarser veins in this section N Y 31R-6 1A-1H - 763.32 764.72 0-140 140 - 935 51-6 Sparsely olivine phyric basalt Medium grained, thick massive flow Flow Gray - N Y 31R-7 1A-7 PP 764.72 766.21 0-149 149 - 935 51-6 Sparsely olivine phyric basalt Medium to fine grained, thick massive flow Flow Gray 0.5- to 1.5-cm-thick, 40-cm-long vein in this section, fine grained at base N Y 32R-1 1 XRF, PP 766.30 766.60 0-30 30 - 935 51-6 Sparsely olivine phyric basalt Fine grained, thick massive flow Flow Gray - N Y 32R-1 2-8 PP, TSB 766.60 767.13 30-83 53 243 53 52-1 Aphyric basalt Fine-grained fractured pillow Pillow Dark gray Fragmented small aphyric or sparsely phyric pillows, breccia Y Y 32R-1 9-15 - 767.13 767.79 83-149 66 - 66 52-2 Aphyric basalt Fine-grained brecciated pillows, interpillow Breccia Dark gray and blue green Some interpillow material, basalt fractured with unusual cavity fills and halos Y Y 32R-2 1-3 XRF 767.79 768.15 0-36 36 - 36 52-3 Aphyric basalt Fine-grained fractured pillow Pillow Dark gray Fragmented small aphyric or sparsely phyric pillows, breccia Y Y 32R-2 3-6 PP 768.15 768.43 36-64 28 - 88 52-4 Aphyric basalt Fine-grained basalt fragments Pillow/flow Dark gray Unordered and unoriented basalt pieces N N 33R-1 1-3 PP 775.70 776.30 0-60 60 - 88 52-4 Aphyric basalt Fine-grained basalt fragments Pillow/flow Dark gray - N N 33R-1 4-12 XRF, TSB 776.30 777.00 60-130 70 1760 94 53-1 Aphyric basalt Fine-grained pillow or thin flow Pillow/flow Gray Rubble basalt pieces at the top of the unit, more vesicles Y Y 33R-2 1-5 - 777.00 777.24 0-24 24 - 94 53-1 Aphyric basalt Fine-grained pillow or thin flow Pillow/flow Gray - Y Y 33R-2 6-7 - 777.24 777.47 24-47 23 - 146 53-2 Aphyric basalt Fine-grained pillow or thin flow Flow Gray Finer grained at upper margin but no chill observed N Y 34R-1 1A-3 PP 785.30 786.53 0-123 123 - 146 53-2 Aphyric basalt Fine-grained pillow or thin flow Flow Gray - N Y 34R-2 1A-1G XRF, PP, TSB*2 786.53 787.23 0-70 70 - 70 53-3 Aphyric basalt Fine rims, medium-grained center Pillow/flow Dark gray to gray - Y Y 34R-2 2A-2B - 787.23 787.59 70-106 36 - 36 53-4 Aphyric basalt Fine rims, medium-grained center Pillow Dark gray to gray Veins with red brown alteration halos Y Y 34R-2 3A-3D - 787.59 787.99 106-146 40 - 80 53-5 Aphyric basalt Fine rims, medium grained center Pillow/flow Dark gray to gray - Y Y 34R-3 1A-3B - 787.99 788.39 0-40 40 - 80 53-5 Aphyric basalt Fine rims, medium grained center Pillow/flow Dark gray to gray - Y Y 34R-3 4-5 TSB 788.39 788.95 40-96 56 - 56 53-6 Aphyric basalt Fine rims, medium grained center Pillow/flow Dark gray to gray Veins with red green alteration halos Y Y 34R-3 7-8 PP 788.95 789.47 96-148 52 - 139 53-7 Aphyric basalt Fine rims, medium grained center Flow Dark gray to gray - Y Y 34R-4 1-3 - 789.47 789.77 0-30 30 - 139 53-7 Aphyric basalt Fine rims, medium grained center Flow Dark gray to gray - Y Y 35R-1 1-5 - 794.90 795.47 0-57 57 - 139 53-7 Aphyric basalt Fine rims, medium grained center Flow Gray - Y Y 35R-1 6-7 PP 795.47 796.27 57-137 80 - 129 53-8 Aphyric basalt Fine rims, medium grained center Flow Gray - Y Y 35R-2 1A-2 PP 796.27 796.76 0-49 49 - 129 53-8 Aphyric basalt Fine rims, medium grained center Flow Gray - Y Y 35R-2 3-6 XRF, PP, TSB 796.76 797.64 49-137 88 - 88 53-9 Aphyric basalt Fine rims, medium grained center Pillow/flow Dark gray to gray - Y Y 35R-3 1-2 - 797.64 797.96 0-32 32 - 32 53-10 Aphyric basalt Fine rims, medium grained center Pillow Dark gray to gray - Y Y 35R-3 3-4 - 797.96 798.42 32-78 46 - 46 53-10 Aphyric basalt Fine rims, medium grained center Pillow Dark gray to gray - Y Y 35R-3 5-6D - 798.42 799.14 78-150 72 - 146 53-12 Aphyric basalt Fine rims, medium grained center Flow Dark gray to gray - Y Y 35R-4 1A-2 PP 799.14 799.88 0-74 74 - 146 53-12 Aphyric basalt Fine rims, medium grained center Flow Dark gray to gray - Y Y 35R-4 3-7 - 799.88 800.64 74-150 76 - 76 53-13 Aphyric basalt Fine rims, medium grained center Pillow/flow Dark gray to gray - N N 36R-1 1-5 XRF, PP*2 804.10 805.44 0-134 134 - 134 53-14 Aphyric basalt Microcrystalline, hypocrystalline at top Flow Gray to dark gray Brecciated top, hypocrystalline at top and base, coarser in center, no chills N N 36R-2 1-2 PP 805.44 805.90 0-46 46 - 46 53-15 Aphyric basalt Microcrystalline, hypocrystalline at top Pillow Gray - N Y 36R-2 3-4 - 805.90 806.77 46-133 87 - 172 53-16 Aphyric basalt Microcrystalline, hypocrystalline at top Flow Dark gray - Y Y 36R-3 1-3 PP 806.77 807.62 0-85 85 - 172 53-16 Aphyric basalt Microcrystalline, hypocrystalline at top Flow Dark gray - Y Y 36R-3 4-8 - 807.62 807.83 85-106 21 - 21 53-17 Aphyric basalt, small angular fragments up to 5 cm Microcrystalline, celadonite and carbonate cement Breccia Dark gray and very dark patches Fragmented angular basalt pieces up to 5 cm, in green and white breccia cement Y N 36R-3 9-10 - 807.83 808.19 106-142 36 - 36 53-18 Aphyric basalt Microcrystalline, hypocrystalline at top Pillow Dark gray and very dark patches - Y N 36R-4 1-4A XRF, PP 808.19 809.64 0-145 145 - 213 53-19 Aphyric basalt Microcrystalline margins, fine-grained center Flow Dark gray to gray Fractured at the base and rubbly Y N 36R-5 1-4 - 809.64 810.32 0-68 68 - 213 53-19 Aphyric basalt Microcrystalline margins, fine-grained center Flow Dark gray to gray - Y N 36R-5 6-8 - 810.32 810.59 68-95 27 1204 - 54 Aphyric basalt Microcrystalline flow top Flow Dark gray to gray Top of flow rubbly and fractured, no contact observed at top N Y 37R-1 1A-1H PP, TSB*3 813.30 814.73 0-143 143 1204 - 54 Aphyric basalt Microcrystalline at top of section, fine grained at base Flow Gray Vesicles up to 0.5 cm, abundance increases toward base of section N Y 37R-2 1A-1B XRF, PP, TSB 814.73 815.80 0-107 107 1204 - 54 Aphyric basalt Fine grained, massive thick flow Flow Gray Abundant smectite- and saponite-filled vesicles up to 0.5 cm. N Y 37R-3 1A-1D PP, TSB 815.80 817.18 0-138 138 1204 - 54 Aphyric basalt Fine grained to medium grained at base of section Flow Speckled gray 40-cm-long, thick vein and vesicles at top, alteration fronts along veins N Y 37R-4 1A-1D PP 817.18 818.37 0-119 119 1204 - 54 Aphyric basalt Medium grained, massive thick flow Flow Speckled dark gray Homogeneous section N Y 37R-5 1A-1E XRF, PP, TSB*3 818.37 819.70 0-133 133 1204 - 54 Aphyric basalt Medium to fine grained, thick massive flow Flow Dark to very dark speckled gray Interval 60-130 cm has dark green gray, brown yellow alteration and miarolitic cavities N Y 37R-6 1A-1D XRF, PP, TSB 819.70 821.14 0-144 144 1204 - 54 Aphyric basalt Medium to fine grained, thick massive flow Flow Speckled dark gray to gray - N Y 37R-7 1A-1B PP 821.14 822.24 0-110 110 1204 - 54 Aphyric basalt Fine grained to medium grained at base Flow Speckled dark gray to gray Altered zone at interval 20-40 cm N Y 38R-1 1A-1D PP 822.80 824.26 0-146 146 1204 - 54 Aphyric basalt Fine grained Flow Dark bluish gray - N Y 38R-2 1A-1G PP 824.26 825.63 0-137 137 1204 - 54 Aphyric basalt Fine grained to microcrystalline at base Flow Dark to very dark gray at base Chilled contact at base against dark fractured pillow basalts N Y 38R-2 2-3 PP 825.63 825.75 137-149 12 458 12 55-1 Aphyric basalt Microcrystalline to hypocrystalline Pillow Very dark gray Glassy margins Y Y 38R-3 1-3 - 825.75 826.00 0-25 25 - 25 55-2 Aphyric basalt Microcrystalline to hypocrystalline Pillow Dark to very dark gray - Y Y 38R-3 3-6 - 826.00 826.30 25-55 30 - 30 55-3 Aphyric basalt Microcrystalline to hypocrystalline Pillow Dark to very dark gray - Y Y 38R-3 7-15 XRF 826.30 827.25 55-150 95 - 149 55-4 Aphyric basalt Microcrystalline Flow Dark to very dark gray Rubble basalt pieces at the base of the unit Y N 38R-4 1-4 - 827.25 827.79 0-54 54 - 149 55-4 Aphyric basalt Microcrystalline Flow Dark to very dark gray - Y N 39R-1 1-7 - 832.20 833.00 0-80 80 - 80 55-5 Aphyric basalt Glassy, hypocrystalline to microcrystalline Pillow/flow Gray to dark gray Hyaloclastite at top 10 cm, glassy and hypocrystalline Y Y 39R-1 8-9 PP 833.00 833.65 80-145 65 - 162 55-6 Aphyric basalt Microcrystalline to fine grained Flow Greenish gray and gray to dark gray Top 5 cm is hyaloclastite Y N 39R-2 1-9 XRF, PP*2, TSB 833.65 834.62 0-97 97 - 162 55-6 Aphyric basalt Fine grained to microcrystalline Flow Gray to dark gray No contact, but highly fractured basalt fragments at base N N 39R-2 10-11 - 834.62 834.87 97-122 25 591 - 56 Aphyric basalt breccia with carbonate-dominated cement Microcrystalline basalt fragments in variable cement Breccia Gray to dark gray basalt clasts Cement is dark greenish black and white N N 40R-1 1A-8 PP, TSB 841.50 842.99 0-149 149 591 - 56 Aphyric basalt breccia with carbonate-dominated cement Microcrystalline basalt fragments in variable cement Breccia Gray to dark gray Carbonate in breccia cement decreases toward the base of the unit N N 40R-2 1-3C XRF, PP 842.99 844.40 0-141 141 591 - 56 Aphyric basalt breccia with carbonate-dominated cement Microcrystalline basalt fragments in variable cement Breccia Gray Basalt clasts are generally angular, some are subangular, variable sizes <1-40 cm N N 40R-3 1-12 PP 844.40 845.87 0-147 147 591 - 56 Aphyric basalt breccia with carbonate-dominated cement Microcrystalline basalt fragments in variable cement Breccia Dark gray, gray to greenish gray Some pieces are glassy, larger clasts, less carbonate in cement N N 40R-4 1-3 - 845.87 846.26 0-39 39 591 - 56 Aphyric basalt breccia with dark cement Microcrystalline basalt fragments in variable cement Breccia Dark to very dark gray Cement becomes darker and greenish black toward base, more fragmented N N 41R-1 1-11 XRF 850.80 851.70 0-90 90 591 - 56 Fragmented aphyric basalt pieces Microcrystalline basalt fragments Pillow/flow Gray to dark gray Rubbly section, containing broken basalt pieces, until top of flow N N 41R-1 12-17 PP 851.70 852.30 90-150 60 238 - 57 Aphyric basalt Microcrystalline Flow Gray No chill, but microcrystalline at margins and coarser in the center N N 42R-1 1A-1J PP 860.00 861.20 0-120 120 238 - 57 Aphyric basalt Microcrystalline to fine grained Flow Gray - N N 42R-2 1A-1C XRF*2, PP, TSB 861.20 861.78 0-58 58 238 - 57 Aphyric basalt Microcrystalline Flow Gray - N N 42R-2 3-12 PP, TSB 861.78 862.48 58-128 70 517 99 58-1 Hyaloclastite with aphyric basalt pillow fragments Glassy, hypocrystalline to microcrystalline Hyaloclastite Dark gray, green to black cement Fresh glass in several pieces N N 42R-3 1-3 - 862.48 862.77 0-29 29 517 99 58-1 Gravel and aphyric basalt pillow fragments Glassy, hypocrystalline to microcrystalline Pillow Dark gray, green to black cement Rubble and gravel at the base N N 43R-1 1-4C - 869.10 869.90 0-80 80 - 80 58-2 Aphyric basalt Microcrystalline to fine grained Pillow/flow Gray to dark gray No chills or contacts, but microcrystalline at margins and coarser in the center N N 43R-1 5 XRF, PP, TSB 869.90 870.33 80-123 43 - 43 58-3 Aphyric basalt Microcrystalline to fine grained Pillow Gray to dark gray - N N 43R-1 6-9 - 870.33 870.56 123-146 23 - 295 58-4 Aphyric basalt Microcrystalline to fine grained Flow Gray Celadonite veins with red brown and green halos N N 43R-2 1-6 PP 870.56 871.92 0-136 136 - 295 58-4 Aphyric basalt Microcrystalline to fine grained Flow Gray - N N 43R-3 1A-7 PP 871.92 873.28 0-136 136 - 295 58-4 Aphyric basalt Microcrystalline to fine grained Flow Gray Brecciated interval at top 20 cm, rubble and microcrystalline at base N N 44R-1 1-2 PP 878.80 880.05 0-125 125 330 - 59 Aphyric basalt Microcrystalline to fine grained Flow Gray Contains many small vesicles, halos along veins N N 44R-2 1A-1G XRF, PP, TSB 880.05 881.52 0-147 147 330 - 59 Aphyric basalt Microcrystalline to fine grained Flow Gray to dark gray 70-cm-long carbonate vein, vesicles decrease toward base of section N N 44R-3 1A-2B PP 881.52 882.10 0-58 58 330 - 59 Aphyric basalt Microcrystalline to fine grained Flow Dark gray Brown and green halos, microcrystalline base, but no chills N N 44R-3 3-10 - 882.10 883.02 58-150 92 1523 99 60-1 Aphyric basalt Microcrystalline Pillow/flow Dark gray Rubbly microcrystalline top N Y 45R-1 1-2 - 888.40 888.47 0-7 7 - 99 60-1 Aphyric basalt Microcrystalline Pillow/flow Dark gray - N Y 45R-1 2-7 PP 888.47 889.02 7-62 55 - 55 60-2 Aphyric basalt Microcrystalline Pillow/flow Dark gray Glassy margins Y Y 45R-1 8-13 TSB 889.02 889.42 62-102 40 - 40 60-3 Aphyric basalt Microcrystalline Pillow Dark gray to dark greenish gray Hyaloclastite at base, glassy and hypocrystalline Y Y 45R-1 13-15 - 889.42 889.74 102-134 32 - 94 60-4 Aphyric basalt Microcrystalline to fine grained Pillow/flow Gray Rubbly base with glassy chills Y Y 45R-2 1A-1D XRF, PP, TSB 889.74 890.36 0-62 62 - 94 60-4 Aphyric basalt Microcrystalline to fine grained Pillow/flow Gray - Y Y 45R-2 2-4 PP 890.36 890.98 62-124 62 - 115 60-5 Aphyric basalt Microcrystalline to fine grained Flow Gray Rubbly basalt pieces, celadonite in some pieces Y Y 46R-1 1-3 XRF, PP, TSB 898.00 898.53 0-53 53 - 115 60-5 Aphyric basalt Microcrystalline to fine grained Flow Gray Glassy chill at base Y Y 46R-1 4 - 898.53 899.40 53-140 87 - 99 60-6 Aphyric basalt Microcrystalline to fine grained Pillow/flow Gray Microcrystalline top N Y 46R-2 1 - 899.40 899.52 0-12 12 - 99 60-6 Aphyric basalt Microcrystalline to fine grained Pillow/flow Gray - N Y 46R-2 2A-6D XRF, PP, TSB 899.52 900.55 12-115 103 - 103 60-7 Aphyric basalt Microcrystalline to fine grained Flow Dark greenish gray 30-cm brecciated interval containing carbonate and celadonite N Y 46R-2 7-8 - 900.55 900.66 115-126 11 - 61 60-8 Aphyric basalt Microcrystalline Pillow/flow Dark gray Red brown and green halos surrounding veins Y Y 46R-3 1-2A PP 900.66 901.16 0-50 50 - 61 60-8 Aphyric basalt Microcrystalline Pillow/flow Dark gray - Y Y 46R-3 3-10 - 901.16 901.80 50-114 64 - 64 60-9 Aphyric basalt Microcrystalline Pillow/flow Gray - Y N 47R-1 1-3 - 907.70 907.93 0-23 23 - 23 60-10 Aphyric basalt Microcrystalline Pillow Dark gray - N Y 47R-1 4-10 XRF, PP 907.93 908.32 23-62 39 - 39 60-11 Aphyric basalt Microcrystalline Pillow Dark gray Rubbly basalt pieces N Y 47R-1 10-19 - 908.32 909.01 62-131 69 - 69 60-12 Aphyric basalt Microcrystalline Pillow/flow Gray Rubbly basalt pieces Y N 48R-1 1A-2D XRF, PP, TSB 916.70 917.58 0-88 88 - 88 60-13 Aphyric basalt Fine grained to microcrystalline with glassy chill Pillow/flow Gray - N Y 48R-1 3-4 - 917.58 918.01 88-131 43 - 105 60-14 Aphyric basalt Microcrystalline to fine grained Flow Dark gray to gray Miarolitic cavities toward base of unit Y Y 48R-2 1-6 - 918.01 918.63 0-62 62 - 105 60-14 Aphyric basalt Microcrystalline to fine grained Flow Dark gray to gray - Y Y 48R-2 7-12 PP 918.63 919.21 62-120 58 - 58 60-15 Aphyric basalt Microcrystalline to fine grained Pillow/flow Gray - Y Y 48R-2 13-14 TSB 919.21 919.48 120-147 27 - 27 60-16 Aphyric basalt Microcrystalline Pillow Dark gray to gray - Y N 48R-3 1-4 XRF 919.48 919.92 0-44 44 - 44 60-17 Aphyric basalt Microcrystalline to fine grained Pillow Gray - Y N 49M-1 1-3 PP, TSB*2 928.30 928.79 0-49 49 - 49 60-18 Aphyric basalt Microcrystalline to hypocrystalline Pillow Dark gray Finer grained at upper and lower margins, but no chills observed N N 49M-1 4-7 - 928.79 929.06 49-76 27 - 27 60-19 Aphyric basalt Microcrystalline to hypocrystalline with glassy chill Pillow Dark gray to gray Glassy piece at top Y Y 49M-1 7-12 PP 929.06 929.40 76-110 34 - 34 60-20 Aphyric basalt Microcrystalline to hypocrystalline with glassy chill Pillow Dark gray to gray Glassy pillow rims Y Y 50M-1 1-3 TSB 931.50 931.76 0-26 26 - 26 60-21 Aphyric basalt Microcrystalline to hypocrystalline with glassy chill Pillow Dark gray to gray Glassy pillow rim at base N Y 50M-1 3-6 XRF, PP, TSB 931.76 932.08 26-58 32 - 32 60-22 Aphyric basalt Microcrystalline to hypocrystalline with glassy chill Pillow Dark gray to gray - Y N 51M-1 1 PP 932.00 932.39 0-39 39 - 39 60-23 Aphyric basalt Microcrystalline to hypocrystalline with glassy chill Pillow Dark gray to gray Glassy pillow rim at base N Y 51M-1 2-4 - 932.39 932.67 39-67 28 - 28 60-24 Aphyric basalt Microcrystalline to hypocrystalline with glassy chill Pillow Dark gray to gray Glassy rim at base Y Y 51M-1 4-5 - 932.67 932.87 67-87 20 - 20 60-25 Aphyric basalt Microcrystalline to hypocrystalline with glassy chill Pillow Dark gray to gray Glassy rim at top Y N 52M-1 1-4 XRF, PP, TSB 932.80 933.65 0-85 85 - 85 60-26 Aphyric basalt Microcrystalline to hypocrystalline at base Pillow/flow Dark gray to gray - N N