Table 4. Summary table of dropstones greater than 1 cm in size found at Site 987. Core, section, interval (cm) Depth (mbsf) Size (cm) Composition Shape 162-987A- 1H-5, 5 6.05 2.8 Granite Subrounded 1H-5, 7 6.07 1.8 Siltstone Subangular 4H-3, 23 30.73 1.2 Fine-grained diorite Subangular 4H-3, 134 31.84 1.0 Fossiliferous limestone Subrounded 4H-3, 138 31.88 1.2 Porphyric granite Subangular 4H-3, 140 31.90 1.8 Syenite Subangular 4H-5, 7 33.57 1.8 Dark diorite Angular 6H-1, 105 47.55 1.5 Light gray siltstone Angular 7H-5, 10 58.30 3.7 Fractured pink quartzite Rounded 7H-5, 52 58.72 1.0 White quartzite Angular 8H-1, 98 60.68 1.3 Black shale Subangular 8H-6, 102 68.22 1.0 Gray-pink quartzite Subangular 9H-3, 146 72.16 2.1 Light gray igneous rock Subangular 9H-4, 51 72.71 2.0 Black igneous rock Subangular 9H-4, 95 73.15 1.5 Black siltstone Subangular 9H-5, 30 74.00 2.0 Light brown layered sandstone Rounded 10H-4, 10 78.97 3.0 Gray siltstone Subangular 10H-4, 127 80.14 3.0 Light quartzite Subangular 11X-3, 75 87.45 4.5 Igneous rock Subangular 12X-1, 37 93.67 1.5 Flat black basalt Angular 14X-2, 7 114.27 2.7 Basalt 14X-2, 109 115.29 2.2 Sandstone 14X-2, 140 115.60 5.0 Basalt 14X-4, 122 118.42 1.2 Pegmatite 14X-6, 20 120.40 2.7 Gray quartzite 15X-2, 7 123.77 1.1 Granite Angular 15X-2, 146 125.16 1.3 Dark gray basalt Subangular 15X-3, 127 126.47 5.8 Granite Subrounded 15X-4, 121 127.91 1.0 Basalt Subangular 15X-5, 3 128.23 1.2 Gray metamorphic rock Subrounded 15X-6, 8 129.78 1.1 Gray metamorphic rock Subangular 17X-4, 1 145.91 2.5 Igneous rock Subrounded 18X-3, 94 154.94 1.2 Brown sedimentary rock Flat 18X-4, 92 156.42 3.8 Yellowish mudstone Subrounded 18X-4, 139 156.89 1.9 Igneous rock Subangular 18X-4, 144 156.94 2.2 Gray igneous rock Subangular 18X-4, 144 156.94 1.5 Gray sedimentary rock Subangular 19X-2, 94 163.14 3.6 Dark gray siltstone 19X-4, 134 166.54 2.4 Dark gray siltstone 20X-1, 130 171.60 1.5 Gray sedimentary rock Subangular 20X-2, 38 172.18 1.8 Light gray quartzite Angular 20X-2, 74 172.54 2.2 Black igneous rock Angular 20X-6, 9 177.89 3.0 Gray metaquartzite Subangular 22X-2, 127 191.27 1.7 Granite Subangular 22X-3, 92 192.34 1.4 Dark diorite Subangular 22X-3, 117 192.59 3.0 Highly weathered granite Subrounded 22X-4, 94 193.86 3.2 Dark limestone Subangular 162-987B- 2H-5, 66 10.86 3.2 Light gray quartzite Subangular 10H-3, 80 82.93 3.3 Sedimentary rock 11H-1, 50 90.20 5.5 Pyritized igneous rock 11H-5, 22 95.92 2.5 Coal 162-987C- 1H-1, 84 0.84 2.3 Granite Subangular 1H-3, 119 4.19 1.8 Dark granite Subangular 2H-3, 10 8.70 2.2 Garnet schist Subrounded 2H-5, 103 12.63 1.0 Weathered sandstone Crumbly 3H-1, 51 15.61 2.4 Granite Angular 3H-1, 111 16.21 1.4 Scoria Subangular 3H-3, 140 19.50 2.7 Basalt Subangular 3H-5, 50 21.60 1.2 Igneous rock Subangular 3H-5, 103 22.13 1.2 Quartz-rich igneous rock Subangular 3H-6, 130 23.90 1.3 Igneous rock Subangular 4H-2, 30 26.40 1.0 Pink granite Subangular 4H-6, 28 32.38 1.9 Light green matemorphic rock Subrounded 4H-6, 137 33.47 1.2 Schist Subangular 162-987D- 3H-1, 140 12.20 1.2 Light gray carbonate-cemented sandstone Rounded 3H-3, 140 15.20 2.0 Fine-grained diorite Subrounded 3H-4, 68 15.98 1.8 Porphyric granite Angular 5H-2, 86 32.16 3.6 Light gray metaquartzite Subangular 5H-2, 104 32.34 3.9 Granite Subangular 5H-2, 116 32.46 3.5 Mafic rock Subangular 5H-2, 141 32.71 1.8 Reddish siltstone Rounded 6H-3, 24 42.54 1.0 Red quartzite Subrounded 6H-3, 134 43.64 1.4 Gray metaquartzite Subrounded 6H-4, 120 45.00 1.0 Gray igneous rock Subrounded 6H-5, 148 46.78 1.0 Green metamorphic rock Subrounded 6H-6, 60 47.40 7.3 Light gray metaquartzite Subrounded 7H-5, 18 54.98 1.7 Black quartzite Subrounded 8H-1, 2 58.32 4.5 Weathered fine-grained granite Subrounded 8H-2, 40 60.20 3.5 Syenite Subangular 9H-4, 10 72.40 2.0 Sedimentary rock Rounded 12X-3, 28 98.08 3.2 Gray igneous rock Subrounded 18X-5, 15 157.75 1.8 Brown siltstone Rounded 19X-3, 106 165.26 1.3 Dark diorite Angular 20X-1, 35 171.25 1.5 Dark schist Subrounded 20X-1, 138 172.28 2.0 Metaquartzite Angular 20X-2, 11 172.51 2.0 Dark granite Angular 20X-2, 43 172.83 3.0 Dark granite Angular 20X-3, 80 174.70 1.2 Light gray siltstone Subrounded 20X-3, 128 175.18 3.0 Dark metaquartzite Subrounded 20X-4, 146 176.86 1.6 Fine-grained muscovite-rich granite Flat 25X-1, 143 210.83 1.2 Brown siltstone Subangular 25X-5, 9 215.49 2.8 Light brown metaquartzite Subangular 26X-3, 131 222.47 3.0 Gray granite Subangular 26X-4, 61 223.27 1.8 Gray granite Rounded 26X-6, 35 226.01 1.5 Dark diorite Angular 26X-6, 35 226.01 2.3 Dark diorite Angular 27X-2, 117 231.27 3.0 Dark gray sulferous siltstone Angular 27X-2, 135 231.45 2.2 Gray metaquartzite Subrounded 27X-3, 82 232.42 1.2 Disintegrated sandstone 27X-3, 149 233.09 1.0 Light gray igneous rock Subangular 27X-4, 8 233.18 1.1 Gray siltstone Angular 27X-4, 148 234.58 2.0 Disintegrated sandstone 27X-6, 100 237.10 2.0 Quartzite Subangular 28X-1, 119 239.39 2.9 Gray granite Subangular 28X-1, 129 239.49 2.2 Dark highly weathered granite Subangular 28X-1, 131 239.51 1.5 Dark basalt Subrounded 28X-1, 132 239.52 1.0 Chloritized granite 30X-4, 124 263.24 1.0 Siltstone Subrounded 31X-6, 40 274.89 1.5 Black mudstone Subangular 32X-4, 95 282.25 8.0 Metamorphic rock Rounded 32X-4, 104 282.34 6.5 Shale Rounded 32X-4, 74 282.04 1.7 Shale 33X-CC, 0 286.40 7.2 Light gray carbonate (dolomite?) 35X-CC, 0 302.60 4.0 Metamorphic rock Subangular 35X-CC, 32 302.92 1.5 Siltstone Subrounded 36X-1 305.60 11 clasts 36X-2 307.10 7 clasts 36X-3 308.60 19 clasts 36X-4 310.10 9 clasts 36X-5 311.60 14 clasts 36X-6 313.10 24 clasts 36X-CC 314.75 1 clast 37X- 315.20 Unspecified number of clasts 38X-1, 70 325.50 1.5 Igneous rock Subangular 38X-1, 72 325.52 2.0 Siltstone Subangular 38X-CC, 2 326.11 2.0 Siltstone Subangular 38X-CC, 10 326.19 1.0 Siltstone Subangular 38X-CC, 14 326.23 3.0 Igneous Subangular 38X-CC, 20 326.29 1.5 Igneous Subangular 38X-CC, 20 326.238X-CC, 14 326.23 3.0 Igneous Subangular 38X-CC, 20 326.29 1.5 Igneous Subangular 38X-CC, 20 326.29 1.7 Siltstone Subangular 38X-CC, 20 326.29 2.3 Siltstone Subangular 38X-CC, 20 326.29 4.0 Metamorphic rock Subangular 38X-CC, 20 326.29 2.8 Metamorphic rock Subangular 38X-CC, 20 326.29 3.7 Igneous rock Subangular 39X-1, 0 24 334.40 1 basalt 39X-1, 0 24 334.40 1 granite 39X-1, 0 24 334.40 1 mudclast 39X-1, 35 44 334.75 4 basaltic rocks 39X-1, 35 44 334.75 2 igneous rocks 39X-1, 35 44 334.75 1 sedimentary rock 39X-1, 61 79 335.01 8 igneous rocks 39X-1, 61 79 335.01 1 quartzite 39X-1, 61 79 335.01 2 sedimentary rocks 39X-1, 61 79 335.01 2 metamorphic rocks 39X-1, 84 96 335.24 2 basaltic rocks 39X-1, 84 96 335.24 3 igneous rocks 39X-1, 84 96 335.24 2 sedimentary rocks 39X-1, 102 113 335.42 2 basaltic rocks 39X-1, 102 113 335.42 2 igneous rocks 39X-1, 102 113 335.42 1 metamorphic rock 39X-1, 121 125 335.61 2 basaltic rocks 39X-1, 121 125 335.61 1 igneous rock 39X-CC, 5 335.76 9.2 Metamorphic rock 39X-CC, 16 36 335.87 2 basaltic rocks 39X-CC, 16 36 335.87 2 igneous rocks 39X-CC, 16 36 335.87 2 metamorphic rocks 39X-CC, 16 36 335.87 1 sedimentary rock 40X-1, 0 344.00 4 basaltic fragments Subrounded 40X-1, 12 344.12 1.1 Sedimentary rock 40X-1, 23 344.23 1.9 Reddish igneous rock 40X-1, 32 48 344.32 2 basaltic rocks 40X-1, 32 48 344.32 4 igneous rocks 40X-1, 32 48 344.32 2 metamorphic rocks 40X-1, 32 48 344.32 2 sedimentary rocks 40X-1, 32 48 344.32 2 igneous rocks 40X-1, 67 71 344.67 1 sedimentary rock 40X-1, 67 71 344.67 1 mudclast 40X-1, 67 71 344.67 Metamorphic rock 40X-1, 85 344.85 4.9 3 basaltic rocks Subrounded 40X-1, 88 102 344.88 5 igneous rocks 40X-1, 88 102 344.88 5 metamorphic rocks 40X-1, 88 102 344.88 2 basaltic rocks 40X-1, 88 102 344.88 3 igneous rocks 40X-1, 105 137 345.05 2 sedimentary rocks 40X-2, 0 3 345.50 1 metamorphic rock 40X-2, 0 3 345.50 1 mudclast 40X-2, 0 3 345.50 1 basalt 40X-2, 26 39 345.76 1 basalt 40X-2, 26 39 345.76 2 metamorphic rocks 40X-2, 26 39 345.76 2 igneous rocks 40X-2, 46 57 345.96 1 sedimentary rock 40X-2, 46 57 345.96 2 metamorphic rocks 40X-2, 46 57 345.96 2 igneous rocks 40X-2, 72 80 346.22 2 basalts 40X-2, 72 80 346.22 2 metamorphic rocks 40X-2, 72 80 346.22 2 igneous rocks 40X-2, 72 80 346.22 1 sedimentary rock 40X-2, 86 102 346.36 1 basalt 40X-2, 86 102 346.36 4 metamorphic rocks 40X-2, 86 102 346.36 4 igneous rocks 40X-2, 86 102 346.36 2 sedimentary rocks 40X-2, 111 127 346.61 3 metamorphic rocks 40X-2, 111 127 346.61 3 igneous rocks 40X-2, 111 127 346.61 1 sedimentary rock 40X-CC 346.79 1 metamorphic rock 40X-CC 346.79 1 igneous rock 41X-1 353.70 10 clasts 41X-2 355.20 16 clasts 41X-3 356.70 17 clasts 41X-4 358.20 8 clasts 41X-5 359.70 3 clasts 41X-CC 360.03 2 clasts 42X-1, 0 363.30 4.5 Siltstone Subangular 42X-1, 30 363.60 1.5 Shale Rounded 42X-1, 37 363.67 3.0 Igneous rock Subrounded 42X-CC, 3 364.24 1.7 Shale Subangular 42X-CC, 7 364.28 1.3 Shale Subangular 42X-CC, 33 364.54 1.5 Shale Subangular 162-987E- 1R-1, 1 363.31 2.4 Reddish quartzite Subrounded 1R-1, 31 363.61 3.0 Reddish granite Subrounded 1R-1, 85 364.15 6.0 Dark igneous rock Subangular 1R-1, 114 364.44 2.5 Gray sandstone Subangular 1R-1, 127 364.57 1.0 Red siltstone Angular 1R-2, 77 365.57 2.5 Gray sandstone with pyrite Subrounded 1R-2, 77 365.57 2.6 Gray diorite Subangular 1R-2, 135 366.15 1.5 Gray sandstone Subangular 1R-3, 15 366.45 7.0 Gray igneous rock Subrounded 1R-3, 27 366.57 1.3 Gray diorite Subrounded 1R-3, 46 366.76 2.2 Dark gray igneous rock Subrounded 1R-CC, 2 366.97 2.0 Gray igneous rock 2R-2, 17 370.87 7.0 Dark gray igneous rock Subangular 3R-1, 138 380.18 7.0 Gray quartzite Subrounded 3R-3, 106 382.86 6.0 Quartzite Subangular 4R-CC, 0 388.40 6.0 Brownish gray limestone Subangular 4R-CC, 10 388.50 5.2 Gray igneous rock Subangular 6R-4, 82 412.92 5.5 Long granite Subrounded 6R-5, 62 414.22 2.5 Dark limestone Subangular 6R-5, 92 414.52 9.0 Gneiss 7R-3, 37 420.57 4.7 Gray sandstone Subrounded 7R-3, 120 421.40 3.2 Dark gray igneous rock Rounded 7R-5, 20 423.40 1.0 Black mudstone Angular 7R-6, 48 425.18 2.6 Pink granite Subrounded 8R-4, 25 431.55 2.4 Tan chert Subrounded 8R-5, 48 433.28 3.0 Black basalt Rounded 8R-5, 54 433.34 2.0 Black basalt Subrounded 9R-2, 117 439.07 1.0 Black mudstone Subrounded 9R-3, 118 440.58 1.1 Red granite 10R-6, 4 453.64 1.2 Dark sedimentary rock 10R-6, 21 453.81 1.8 Gneiss 11R-3, 39 459.19 5.6 Gray sedimentary rock 11R-3, 43 459.23 5.9 Black basalt Subrounded 11R-3, 112 459.92 1.3 Black sedimentary rock Subrounded 12R-1, 29 465.69 1.1 Gneiss 12R-1, 102 466.42 2.1 Gneiss 12R-2, 10 467.00 3.5 Pink crystalline rock 12R-2, 29 467.19 1.2 Quartzite 12R-2, 139 468.29 1.2 Pink crystalline rock 12R-3, 5 468.45 1.2 Siltstone 13R-1, 145 476.45 1.5 Siltstone 14R-1, 93 485.53 2.0 Siltstone Subrounded 15R-4, 104 499.74 1.2 Crystalline rock 16R-1, 62 504.42 3.2 Gray magmatic rock 16R-1, 148 505.28 1.2 Light gray quartzite Subangular 17R-4, 10 518.00 2.0 Orange crystalline rock Subangular 18R-1, 138 524.38 >10.0 Gray siltstone 18R-3, 145 527.45 1.1 Igneous rock 18R-4, 80 528.30 >8.0 Gray metamorphic rock 18R-5, 22 529.22 1.7 Light gray igneous rock Subrounded 18R-5, 34 529.34 1.9 Dark gray metamorphic rock Subangular 21R-5, 90 558.70 7.0 Light gray limestone Subangular 23R-5, 77 577.77 1.2 Granite Rounded 23R-5, 53 577.53 1.0 Granite Rounded 24R-2, 55 582.65 3.0 Granite Subrounded 24R-2, 29 582.39 2.0 Black igneous rock Subangular 24R-2, 112 583.22 3.5 Igneous rock Subangular 24R-3, 100 584.60 >3.0 Carbonate cemented sedimentary rock 29R-1, 32 629.12 3.0 Granite Subrounded 29R-2, 25 630.55 2.8 Siltstone Subrounded 29R-2, 115 631.45 3.0 Siltstone Subangular 29R-3, 80 632.60 1.2 Metamorphic rock Subangular 30R-1, 0 638.40 4.8 Gray igneous rock Subrounded 30R-1, 18 638.58 1.8 Greenish sedimentary rock Flat 30R-1, 23 638.63 2.4 Gray metamorphic rock Subrounded 30R-1, 31 638.71 1.8 Reddish igneous rock Subangular 30R-1, 51 638.91 1.7 Igneous rock Subangular 30R-1, 91 639.31 1.0 Igneous rock Subangular 30R-2, 16 640.01 2.2 Gray igneous rock Subangular 30R-2, 40 640.25 4.0 Reddish metmorphic rock Subrounded 31R-1, 2 648.02 4.0 Metamorphic rock Subrounded 31R-2, 149 650.93 4.5 Metamorphic rock Rounde Reddish metmorphic rock Subrounded 31R-1, 2 648.02 4.0 Metamorphic rock Subrounded 31R-2, 149 650.93 4.5 Metamorphic rock Rounded 33R-1, 53 667.73 2.0 Gneiss 33R-1, 57 667.77 1.1 Siltstone 37R-1, 12 705.72 4.2 Black basalt Subrounded 37R-3, 50 708.44 1.2 Dark gray igneous rock 37R-4, 92 710.20 1.5 Gray igneous rock Subangular 38R-3, 25 718.45 1.3Siltstone Subrounded 38R-3, 102 719.22 >7.0 Limestone 41R-2, 130 746.68 6.0 Gray granite 43R-1, 0 763.20 7.0 Light gray granite 43R-1, 0 763.20 6.0 Light grayish brown limestone 44R-1, 62 773.42 1.0 Granite 47R-5, 126 809.06 1.4 Gneiis 50R-1, 110 831.70 1.1 Igneous rock Subrounded dimentary rock