Measured By H. Miller and E. Gutentag
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| Unit No. |
Description |
Thickness |
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Pierre-Niobrara
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|
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18
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Weathered zone
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2 - 3 ft.
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|
17
|
Gypsum
|
0.1 ft.
|
|
16
|
Shale - gray
|
0.9 ft.
|
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15
|
Gypsum
|
0.1 ft.
|
|
14
|
Shale - gray
|
1 ft.
|
|
13
|
Gypsum
|
0.1 ft.
|
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12
|
Shale - gray
|
1.2 ft.
|
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11
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Gypsum
|
0.05 ft.
|
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10
|
Shale - gray
|
1.1 ft.
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9
|
Gypsum
|
0.1 ft.
|
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8
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Shale - gray
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0.4 ft.
|
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7
|
Gypsum
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0.05 ft.
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6
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Shale - medium light gray
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0.8 ft.
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5
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Gypsum
|
0.05 ft.
|
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4
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Shale - light gray, local sand lenses at base; irregular contact (base of Pierre shale
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0.6 ft.
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3
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Chalk - medium light gray (top of Nibrara)
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1.1 ft.
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2
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Claystone - white
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0.1 ft.
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|
1
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Chalk - gray, fresh color is grayish-black
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0.5 ft.
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