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Hole Number: 872E Associated Wells: None
<br /> Date Drilled: 4/17-19/86 Location: T46N, R16W
<br /> Drilled By: Alan Chiles SEk, NEk, Sec. 1
<br /> Logged By: Cary Wendt Coordinates: N 599,2511
<br /> Elevation: 5672' E 1,116,0081
<br /> Depth Increment Description of Strata/Lithologic Unit Designation
<br /> (feet)
<br /> 44.2 - 45.3 SANDSTONE, shaley, gray, soft, NE, light gray soft to slightly
<br /> hard shale at 44.5 - 45.3, Unit 1
<br /> 45.3 - 49.9 SANDSTONE, mottled light gray and gray, very hard, NE, indurated
<br /> with no fractures or bedding planes, soft sandy shale streak at
<br /> 46.14 - 46.16, extremely hard light gray to white quartz like
<br /> zone at 46.6 - 46.9, Unit 1
<br /> 49.9 - 53.5 SHALE, gray, soft to slightly hard, NE, sandy at 49.9 - 50.21
<br /> white quartz like nodule at 53.3 - 53.5 in half of core, Unit 1
<br /> 53.5 - 79.1 SANDSTONE, mottled gray and light gray, hard, NE, 0.01 foot soft
<br /> shaley sandstone encapsulates bedding planes at 54.0, 54.2, 54.4,
<br /> 54.9, 55.3, 55.95, 56.35, 56.7, 57.10 - 57.95 and 58.9, indurated
<br /> and very hard from 60.0 - 79.1, 10% black organic lamella and
<br /> streaks at 70.3 - 71.2, slightly shaley at 78.5 - 79.1 , Unit 1
<br /> 79.1 - 87.4 SHALE, sandy, mottled gray and light gray, hard, NE, intensely
<br /> fractured at 85.5, Unit 1
<br /> 87.4 - 88.9 SANDSTONE, light gray, very hard, NE, occasional pyrite nodules,
<br /> Unit 1
<br /> 88.9 - 89.5 SHALE, gray, hard, NE, black coal streak at 88.9 - 89.0, Unit 1
<br /> 89.5 - 95.1 SANDSTONE, light brownish gray, very hard, NE, indurated from
<br /> 90.0 - 92.0, common pyrite nodules, hard very dark gray shale
<br /> streak with pyrite at 93.45 - 93.60, Unit 1
<br /> 95.1 - 96.6 SANDSTONE, shaley, gray with light gray sandstone, hard, NE,
<br /> common pyrite nodules, Unit 2
<br /> 96.6 - 98.6 SHALE, very dark gray, hard, NE, predominantly sandstone with
<br /> pyrite at 98.3 - 98.5, Unit 2
<br /> 98.6 - 99.2 COAL, upper Dakota seam, Unit 2
<br /> 99.2 - 99.4 SANDSTONE, light gray, hard, NE, Unit 2
<br /> 99.4 - 99.6 SHALE, dark gray, slightly hard, NE, fractured, carbonaceous,
<br /> Unit 2
<br /> 99.6 - 100.4 SANDSTONE, light gray, hard, NE, carbonaceous shale streak at
<br /> 100.33 100.38, Unit 2
<br /> 6-1-86 Revised 04/11/88
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