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Hole Number: 881E Associated Wells: None
<br /> Date Drilled: 8/26-27/87 Location: T46N, R15W
<br /> Drilled By: Bob Maston NWk, NW$, Sec. 6
<br /> Logged By: Gary Wendt Coordinates: N 599,6791
<br /> Elevation: 5705' E 1 ,117,4551
<br /> Depth Increment Description of Strata/Lithologic Unit Designation
<br /> (feet)
<br /> 83.6 - 86.6 SHALE, gray to dark gray, slightly hard, NE, hard light gray
<br /> sandstone at 84.1 - 84.4, 84.9 - 85.0, and 86.0 - 86.1, slightly
<br /> hard very dark gray to black carbonaceous shale at 85.8 - 86.0
<br /> and 86.1 - 86.3, Unit 2
<br /> 86.6 - 87.9 SANDSTONE, light gray, very hard, NE, few black organic lamella,
<br /> Unit 3
<br /> 87.9 - 88.5 SHALE, dark gray, hard, NE, Unit 3
<br /> 88.5 - 90.1 SANDSTONE, mottled light gray and gray, very hard, NE, coarse
<br /> grained, Unit 3
<br /> 90.1 - 92.3 SANDSTONE, very light gray, extremely hard, NE, increasing black
<br /> organic lamella at 91.1 - 92.3, slightly hard fractured gray
<br /> shale at 91 .35 - 91.45, Unit 3
<br /> 92.3 - 93.7 SHALE, very dark gray, hard, NE, carbonaceous at 92.6 - 92.9,
<br /> hard light gray sandstone at 92.95 - 93.10, Unit 4
<br /> 93.7 - 94.8 SHALE, very dark gray to black, soft, NE, carbonaceous, Unit 4
<br /> 94.8 - 100.9 COAL, lower Dakota seam, soft brown sandy shale at 95.1 - 95.3,
<br /> soft brown shaley sandstone at 96.25 - 96.30 and 96.40 - 96.45,
<br /> Unit 5
<br /> 100.9 - 101.1 SHALE, very dark gray to black, soft to slightly hard, NE,
<br /> carbonaceous, Unit 6
<br /> 101.1 - 101.6 SANDSTONE, light gray, hard, NE with 20 percent soft to slightly
<br /> hard gray shale lamella and streaks, Unit 6
<br /> 101.6 - 101.7 SANDSTONE, light gray, very hard, NE, Unit 6
<br /> 101.7 TOTAL CORE SAMPLE DEPTH
<br /> Notes: Ground water encountered at 9.8 - 14.0 and 19.5 - 22.2 feet
<br /> Chip samples collected with sampling buckets from 0.0 to 13.5 feet utilizing a 5 >4
<br /> inch Tricone rock bit
<br /> 3 inch core barrel with Chris dril bit utilized from 13.5 - 101.7 feet
<br /> Water injected occasionally from 9.8 - 101.7 feet
<br /> No underburden core samples were collected
<br /> NE - noneffervescent, SE - slightly effervescent, ME - moderately effervescent,
<br /> VE - violently effervescent
<br /> 6-1-90 Revised 04/11/88
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