Table 5. Summary table of dropstones greater than 2 cm in size found at Site 986. Core, section, interval (cm) Depth (mbsf) Size (cm) Composition Sediment color Shape 162-986A- 1H-2, 108 2.58 2.0 Syenite Pink Subangular 3H-6, 15 21.75 4.5 Granite Angular 4H-3, 14 26.74 3.3 Schist Black Subangular 4H-5, 146 31.06 3.7 Layered sandstone 5H-4, 72 38.32 5.8 Quartz-rich sandstone Subrounded 5H-4, 98 38.58 7.9 Quartz-rich sandstone Subrounded 5H-5, 9 39.19 2.2 Highly weathered sandstone Brown 5H-5, 18 39.28 2.0 Siltstone Black Subrounded 5H-5, 56 39.66 2.4 Siltstone Black Subrounded 5H-6, 41 41.01 2.4 Elongate schist Subrounded 6H-4, 21 47.31 2.0 Sandstone Gray Subangular 8H-1, 37 61.97 2.0 Sedimentary rock Angular 8H-1, 90 62.50 3.5 Granite Subangular 8H-6, 135 70.40 5.0 Sedimentary rock Angular 9H-1, 67 71.77 2.0 Coal fragment Black Subangular 9H-1, 79 71.89 3.3 Siltstone Dark gray Subangular 9H-2, 138 73.98 2.3 Siltstone Dark gray Subrounded 9H-3, 1 74.11 2.0 Sedimentary rock Gray Flat 9H-3, 128 75.38 4.2 Schist Gray Subangular 9H-4, 17 75.77 3.5 Siltstone Dark-gray Subrounded 9H-4, 95 76.55 2.5 Siltstone Dark-gray Subrounded 9H-5, 0 77.10 3.1 Sedimentary rock Brownish Subrounded 9H-5, 19 77.29 2.7 Sedimentary rock Brownish Subrounded 9H-5, 77 77.87 2.6 Metamorphic rock Light Subangular 9H-CC, 1 78.39 4.0 Siltstone Gray Subrounded 10H-3, 36 81.95 2.0 Siltstone Gray 10H-3, 55 82.14 2.8 Quartzite Gray Subrounded 10H-4, 78 83.87 2.6 Siltstone Dark gray 10H-4, 115 84.24 4.5 Metamorphic rock Light gray 10H-4, 136 84.45 2.6 Siltstone Light gray Subrounded 10H-5, 30 84.89 3.0 Quartzite Light gray Subangular 10H-6, 20 86.29 3.2 Shale Black 10H-7, 8 87.67 3.2 Crystalline Subrounded 10H-7, 76 88.35 2.0 Siltstone Dark gray 10H-7, 87 88.46 2.0 Siltstone Light gray 10H-CC, 20 88.89 4.5 Sandstone Gray 11H-CC, 0 95.51 16.5 Metamorphic rock Gray Subrounded 12H-1, 0 95.60 6.0 Sedimentary rock Gray Subrounded 12H-1, 26 95.86 5.4 Sedimentary rock Flat 12H-1, 38 95.98 5.3 Siltstone Subrounded 12H-2, 124 98.34 4.2 Sedimentary rock Gray Subrounded 14H-1, 65 106.25 6.0 Siltstone Light gray 14H-2, 83 107.93 3.6 Siltstone Gray 16X-1, 126 120.56 5.0 Sedimentary rock Flat 19X-1, 77 148.87 2.1 Siltstone Brown Subangular 19X-4, 39 152.99 2.3 Layered sandstone Dark 20X-1, 77 158.57 2.0 Metamorphic rock Dark Angular 20X-1, 145 159.25 3.7 Sandstone Gray Subrounded 20X-2, 32 159.62 2.0 Sedimentary rock Dark Rounded 20X-3, 46 161.26 6.0 Sandstone Gray Subangular 20X-3, 93 161.73 2.0 Sandstone Dark Subrounded 20X-4, 18 162.48 3.6 Sandstone Subrounded 20X-4, 78 163.08 2.6 Claystone Subangular 20X-4, 83 163.13 2.4 Sedimentary rock Gray Subangular 20X-4, 103 163.33 2.0 Sandstone Subangular 20X-4, 139 163.69 2.2 Sandstone Dark Angular 21X-1, 13 167.63 2.6 Weathered sandstone Gray Subrounded 21X-1, 70 168.20 4.0 Sandstone Subrounded 21X-2, 54 168.94 2.0 Shale Black 21X-2, 57 168.97 4.3 Sandstone Subangular 21X-3, 21 169.23 4.5 Sandstone Dark gray Subangular 21X-3, 37 169.39 2.1 Diorite Subangular 21X-3, 84 169.86 3.3 Layered sedimentary rock Subangular 21X-3, 96 169.98 5.3 Sedimentary rock Dark Subrounded 21X-3, 110 170.12 2.8 Weathered sedimentary rock Dark Subangular 23X-2, 32 188.62 5.0 Quartz Pink Rounded 23X-3, 9 189.89 2.0 Shale Black 23X-4, 26 191.56 3.0 Shale Black 23X-CC, 1 192.68 6.0 Metamorphic rock Dark Angular 24X-5, 20 202.60 3.4 Quartz-rich sandstone Dark Subangular 162-986B- 2H-1, 82 6.82 3.0 Sandstone Dark gray Subangular 2H-4, 79 11.29 3.1 Siltstone Gray Angular 2H-4, 138 11.88 2.2 Siltstone Black Angular 2H-5, 13 12.13 2.2 Igneous crystalline rock Subrounded 162-986C- 1H-1, 57 0.57 2.5 Sandstone Dark Rounded 3H-3, 61 20.61 2.2 Sandstone Subrounded 5H-3, 11 37.79 2.8 Mudstone Black Subrounded 5H-4, 14 39.32 4.5 Metamorphic rock Gray Subrounded 5H-4, 99 40.17 6.2 Siltstone Black Subrounded 10X-1, 8 80.68 3.5 Metamorphic rock Subangular 10X-2, 84 82.94 2.8 Sedimentary rock 10X-2, 113 83.23 2.0 Siltstone 10X-3, 50 84.10 2.5 Sedimentary rock Angular 10X-4, 50 85.60 4.5 Sedimentary rock Subrounded 10X-4, 71 85.81 4.7 Metamorphic rock Subangular 10X-5, 117 87.77 2.5 Sedimentary rock 11X-2, 124 92.94 4.0 Igneous rock 14X-1, 5 119.25 4.8 Sandstone Subrounded 14X-3, 8 121.52 2.7 Sandstone Dark Subangular 14X-3, 25 121.69 2.6 Layered mudstone Angular 14X-4, 143 124.37 2.7 Highly weathered sandstone 15X-1, 81 129.61 2.0 Sandstone Dark Subrounded 15X-2, 134 131.13 3.8 Gneiss 15X-4, 102 133.81 2.5 Claystone Gray Subangular 16X-4, 78 143.43 2.5 Siltstone Black Subrounded 16X-5, 69 144.84 2.2 Quartzite Subrounded 16X-5, 115 145.30 5.3 Layered silt- and sandstone 16X-5, 119 145.34 5.0 Layered silt- and sandstone 16X-5, 125 145.40 6.0 Layered silt- and sandstone 17X-2, 4 149.64 3.6 Weathered carbonate Brown Rough textured 17X-4, 129 153.89 3.2 Quartzite Rounded 19X-1, 56 167.96 2.7 Gneiss Subangular 21X-3, 70 190.40 3.4 Sedimentary rock 22X-1, 13 196.43 8.0 Layered sandstone Gray Subrounded 22X-1, 39 196.69 5.7 Siltstone Black Subrounded 22X-3, 22 199.52 2.0 Sandstone Rounded 26X-1, 15 234.85 4.5 Siltstone Dark gray 26X-1, 44 235.14 2.0 Siltstone Dark gray 28X-1, 23 254.23 4.1 Shale Black Subangular 28X-1, 26 254.26 6.4 Sedimentary rock Greenish gray Subrounded 28X-1, 42 254.42 2.1 Sedimentary rock Flat 28X-1, 62 254.62 5.2 Sedimentary rock Subrounded 28X-1, 81 254.81 2.1 Metamorphic rock Subrounded 28X-1, 87 254.87 2.0 Siltstone Gray Subangular 28X-1, 107 255.07 2.0 Basalt Subangular 28X-1, 115 255.15 8.8 Sedimentary rock Subrounded 30X-1, 142 265.02 2.0 Sandstone Rounded 31X-2, 35 275.05 3.0 Sandstone Light gray 31X-3, 75 276.95 3.5 Siltstone Gray 31X-5,unded 31X-2, 35 275.05 3.0 Sandstone Light gray 31X-3, 75 276.95 3.5 Siltstone Gray 31X-5, 75 279.95 2.0 Siltstone Gray 31X-CC, 35 280.43 3.5 Siltstone Dark gray 33X-CC, 0 292.40 6.0 Crystalline Gray 34X-CC, 5 304.36 5.0 Sandstone Gray 35X-1, 60 312.30 2.6 Metamorphic rock Subangular 35X-1, 74 312.44 2.0 Sandstone Subrounded 35X-1, 83 312.53 3.7 Sedimentary rock Rounded 35X-1, 108 312.78 4.0 Siltstone Rounded 35X-1, 121 312.91 3.2 Sedimentary rock Subrounded 35X-1, 135 313.05 2.0 Metamorphic rock Subangular 35X-2, 34 313.54 5.6 Sedimentary rock Angular 35X-2, 38 313.58 2.7 Sandstone Subrounded 35X-2, 45 313.65 3.0 Siltstone Angular 35X-CC, 5 314.00 5.0 Siltstone Subrounded 35X-CC, 32 314.27 2.5 Siltstone Subrounded 36X-1, 7 321.37 8.0 Siltstone Subrounded 36X-1, 30 321.60 5.2 Siltstone Subrounded 36X-1, 43 321.73 3.5 Siltstone Subrounded 36X-CC, 3 321.96 3.0 Siltstone Angular 36X-CC, 14 322.07 5.0 Siltstone Angular 36X-CC, 22 322.15 4.0 Siltstone Angular 37X-5, 90 336.69 2.2 Sedimentary rock Dark Subrounded 37X-8, 54 339.79 3.0 Sandstone Subrounded 38X-1, 14 340.74 4.7 Metamorphic rock Subrounded 38X-1, 60 341.20 3.5 Layered sedimentary rock Subrounded 38X-1, 101 341.61 3.1 Metamorphic rock Dark 38X-1, 120 341.80 2.0 Sandstone Subangular 38X-2, 70 342.80 2.0 Sandstone Dark Subangular 38X-2, 132 343.42 2.0 Metamorphic rock Gray Subrounded 38X-3, 23 343.83 3.3 Sandstone Subrounded 38X-3, 90 344.50 2.4 Sedimentary rock Subrounded 38X-3, 124 344.84 2.2 Claystone Subangular 39X-1, 101 351.21 3.0 Sandstone Subrounded 39X-2, 80 352.50 2.0 Basalt Dark Angular 39X-3, 98 354.18 3.0 Weathered sandstone Subrounded 40X-1, 70 360.50 2.0 Sandstone Subangular 40X-1, 113 360.93 2.0 Sandstone Rounded 40X-1, 116 360.96 2.0 Siltstone Subangular 40X-1, 125 361.05 6.5 Weathered sandstone Subangular 40X-2, 30 361.60 5.0 Highly weathered sandstone 41X-5, 30 375.70 2.8 Sandstone Subangular 42X-1, 82 379.92 2.3 Quartzite Gray Subrounded 42X-1, 130 380.40 4.3 Igneous cristalline rock Black Subrounded 42X-2, 10 380.70 2.4 Metamorphic rock Gray Subrounded 42X-2, 109 381.69 3.5 Sandstone Gray Subrounded 42X-3, 102 383.12 4.1 Limestone Rounded 42X-4, 30 383.90 5.2 Metamorphic rock Black Subangular 42X-4, 47 384.07 3.4 Layered limestone Gray Subrounded 42X-4, 66 384.26 2.4 Sandstone Black Subrounded 42X-4, 76 384.36 2.9 Limestone Gray Rounded 42X-4, 80 384.40 3.1 Sandstone Gray Subangular 42X-4, 96 384.56 3.0 Crystalline rock Subrounded 42X-4, 101 384.61 2.6 Crystalline rock Gray Subrounded 42X-CC, 10 384.88 2.7 Limestone Rounded 42X-CC, 12 384.90 2.6 Limestone 42X-CC, 15 384.93 5.8 Quartzite Black Subrounded 42X-CC, 20 384.98 4.2 Limestone Subrounded 42X-CC, 20 384.98 2.9 Limestone Subrounded 42X-CC, 27 385.05 2.6 Limestone Subrounded 42X-CC, 30 385.08 6.0 Quartzite Light gray Subangular 43X-1, 35 389.05 7.0 Igneous rock Black Subangular 43X-1, 59 389.29 3.0 Siltstone Gray Subangular 43X-1, 70 389.40 2.0 Siltstone Gray Subangular 43X-1, 95 389.65 3.5 Weathered sandstone Subangular 43X-2, 23 390.43 2.4Metamorphic rock Dark Angular 43X-2, 41 390.61 6.0 Igneous rock Dark Subrounded 43X-2, 46 390.66 4.0 Quartzite Angular 43X-2, 48 390.68 4.0 Quartzite Angular 43X-2, 55 390.75 3.3 Igneous rock Dark Rounded 43X-2, 57 390.77 3.0 Sandstone Dark Subrounded 43X-2, 60 390.80 4.8 Metamorphic rock Subangular 43X-2, 74 390.94 3.0 Metamorphic rock Dark 43X-2, 113 391.33 3.0 Claystone 162-986D- 1R-1, 0 387.80 5.0 Siltstone Gray 1R-1, 1 387.81 4.0 Siltstone Dark gray 1R-1, 2 387.82 2.4 Siltstone Light gray 1R-1, 3 387.83 3.5 Siltstone Gray 1R-1, 4 387.84 2.2 Claystone Black 2R-1, 14 397.54 3.3 Siltstone Subangular 2R-1, 14 397.54 3.5 Siltstone Subangular 2R-1, 30 397.70 2.9 Siltstone Subangular 2R-CC, 5 402.94 2.5 Siltstone Subrounded 3R-1, 8 407.18 4.6 Igneous rock Subrounded 3R-1, 16 407.26 4.5 Limestone Subangular 3R-1, 19 407.29 6.2 Limestone Subrounded 3R-1, 57 407.67 3.5 Limestone Subangular 3R-1, 61 407.71 2.0 Limestone Subangular 3R-1, 67 407.77 2.7 Sedimentary rock Subrounded 3R-1, 70 407.80 3.0 Igneous rock Subrounded 3R-CC, 0 407.82 5.7 Sedimentary rock Subrounded 3R-CC, 2 407.84 5.8 Limestone Subrounded 3R-CC, 4 407.86 5.8 Metamorphic rock Subrounded 3R-CC, 6 407.88 2.6 Limestone Subangular 3R-CC, 8 407.90 2.4 Igneous rock Subangular 3R-CC, 10 407.92 3.1 Limestone Subangular 5R-CC, 0 426.30 5.7 Siltstone Gray Subrounded 5R-CC, 1 426.31 5.0 Quartzite Subrounded 5R-CC, 2 426.32 3.5 Siltstone Gray Subrounded 5R-CC, 3 426.33 2.2 Siltstone Gray Subangular 5R-CC, 4 426.34 2.5 Siltstone Gray Subangular 5R-CC, 5 426.35 5.5 Quartzite Pinkish gray Subrounded 5R-CC, 6 426.36 2.8 Sandstone Gray Subrounded 5R-CC, 7 426.37 3.0 Quartzite Pinkish gray Subrounded 5R-CC, 8 426.38 4.2 Siltstone Gray Subangular 5R-CC, 9 426.39 3.6 Siltstone Gray Subangular 6R-CC, 8 437.48 3.5 Siltstone Angular 7R-CC, 0 445.50 5.5 Limestone Gray 8R-1, 0 455.10 6.0 Layered sedimentary rock Subrounded 8R-1, 53 455.63 2.0 Limestone Subrounded 8R-1, 120 456.30 3.0 Granite Subrounded 8R-1, 128 456.38 2.5 Granite Rounded 8R-2, 22 456.82 3.0 Sedimentary rock Rounded 8R-2, 27 456.87 5.0 Limestone Rounded 8R-CC, 6 457.00 2.0 Quartzite Subangular 9R-1, 8 464.78 9.0 Quartzite Light Subrounded 9R-1, 16 464.86 2.5 Sandstone Dark Subangular 9R-1, 16 464.86 2.7 Sandstone Dark Subangular 9R-1, 16 464.86 2.6 Metamorphic rock Subangular 9R-1, 24 464.94 5.6 Sandstone Dark gray Subangular 9R-1, 29 464.99 6.0 Quartzite Light gray Subrounded 9R-1, 33 465.03 3.8 Limestone Light gray Subrounded 9R-1, 35 465.05 4.8 Quartzite White Subangular 9R-1, 39 465.09 5.0 Layered limestone Dark Angular 10R-5.05 4.8 Quartzite White Subangular 9R-1, 39 465.09 5.0 Layered limestone Dark Angular 10R-CC, 0 474.30 6.2 Limestone Light gray Subangular 10R-CC, 5 474.35 4.5 Limestone Dark Subangular 10R-CC, 10 474.40 2.0 Limestone Light gray 10R-CC, 10 474.40 3.0 Limestone Dark brown 10R-CC, 14 474.44 4.0 Metamorphic rock Subangular 11R-1, 0 483.90 4.8 Darl limestone Subangular 11R-1, 4 483.94 2.9 Limestone Very light gray Subangular 11R-1, 4 483.94 2.2 Siltstone Light brownish Subangular 11R-1, 4 483.94 2.2 Highly weathered granite Dark Subrounded 11R-1, 4 483.94 2.0 Metamorphic rock Dark Subangular 14R-1, 0 512.70 6.5 Sandstone Gray 14R-1, 2 512.72 4.7 Sandstone Gray Subangular 14R-1, 2 512.72 4.1 Sandstone Gray Subangular 14R-1, 5 512.75 2.5 Sandstone Gray Subangular 14R-1, 5 512.75 3.8 Sandstone Gray Subangular 14R-1, 103 513.73 2.4 Layered limestone Light gray Subangular 14R-1, 103 513.73 3.5 Limestone Light gray Subangular 14R-1, 107 513.77 6.2 Sandstone Light gray Subangular 14R-1, 116 513.86 4.5 Sedimentary rock Dark gray Subrounded 14R-4, 15 517.35 2.0 Sedimentary rock Gray Subangular 15R-1, 55 522.85 2.1 Igneous crystalline Gray Subangular 15R-2, 26 524.06 6.0 Igneous crystalline Gray Subrounded 15R-3, 62 525.92 2.2 Igneous crystalline Subrounded 15R-5, 0 528.30 2.6 Sandstone Subrounded 15R-5, 62 528.92 3.3 Layered siltstone Brown 16R-1, 30 532.20 3.0 Sandstone 27R-1, 0 637.70 7.0 Limestone Gray 27R-1, 8 637.78 9.0 Limestone Gray 27R-1, 20 637.90 5.0 Limestone Gray Subangular 43R-1, 52 791.92 3.0 Igneous rock Black Subrounded 43R-2, 135 794.25 6.0 Carbonate cemented sandstone 43R-2, 140 794.30 4.5 Carbonate cemented sandstone 43R-2, 145 794.35 5.0 Layered sandstone Gray 0X-1, 70 360.50 2.0 Sand