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Hole Number: 870E Associated Wells: None
<br /> Date Drilled: 4/15-16/86 Location: T46N, R15W
<br /> Drilled By: Alan Chiles NEk, NW$, Sec. 6
<br /> Logged By: Gary Wendt Coordinates: N 599,188'
<br /> Elevation: 5703' E 1,119,142'
<br /> Depth Increment Description of Strata/Lithologic Unit Designation
<br /> (feet)
<br /> 61.2 - 65.3 SANDSTONE, light gray, hard, NE, shaley at 62.04 - 62.25 and
<br /> 63.35 - 63.45, Unit 3
<br /> 65.3 - 66.6 SANDSTONE, shaley, gray, hard, NE, Unit 3
<br /> 66.6 - 68.9 SANDSTONE, light gray, hard, NE, 5-10% dark gray organic lamella
<br /> at 67.65 - 67.75 and 68.4 - 68.9, Unit 3
<br /> 68.9 - 71.1 SHALE, dark gray, hard, NE, soft to slightly hard at 70.0 - 70.2,
<br /> Unit 4
<br /> 71.1 - 78.4 COAL, lower Dakota seam, highly fractured at 71.10 - 71.25,
<br /> common pyrite at 71.25 - 71.30, light gray to gray intensely
<br /> fractured slightly hard sandy shale stringer at 72.3 - 72.6, gray
<br /> sandstone streaks at 73.38 - 73.42 and 73.48 - 73.52, Unit 5
<br /> 78.4 - 80.0 SANDSTONE, light gray, very hard and indurated, NE, 5% dark gray
<br /> organic lamella, very dark gray shale contact at 78.40 - 78.55,
<br /> Unit 6
<br /> 80.0 - 82.7 SHALE, gray to dark gray, hard, NE, sandy at 80.7 - 80.9 and 81.2
<br /> - 81.9, black intensely fractured coal and carbonaceous shale at
<br /> 82.5 - 82.6, Unit 6
<br /> 82.7 - 90.0 SANDSTONE, light gray, hard to extremely hard, indurated, NE,
<br /> black organic lamella occur at bedding planes at 83.75 and 85.25,
<br /> 5% black organic lamella at 87.75 - 90.0, Unit 6
<br /> 90.0 TOTAL CORE SAMPLE DEPTH
<br /> Notes: Ground water encountered at 9.2 feet
<br /> 2 inch push core barrel used from 0.0 - 5.7 feet
<br /> 3 inch core barrel with Chris dril bit utilized from 5.7 - 90.0 feet
<br /> NE - noneffervescent, SE - slightly effervescent, VE - violently effervescent
<br /> 6-1-81 Revised 04/11/88
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