Section along Chalk Creek, North of area
Measured By H. Miller and E. Gutentag
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| Unit No. |
Description |
Thickness |
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Niobrara
|
|
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17
|
Hard yellow chalk (rubbly)
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7.5 ft.
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16
|
Hard yellow and gray chalk
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2.6 ft.
|
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15
|
Bentonite
|
0.025 ft.
|
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14
|
Hard, light yellowish gray chalk
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7.1 ft.
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13
|
Gray chalk
|
15.9 ft.
|
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12
|
Limonite and bentonite
|
0.25 ft.
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11
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Gray chalk
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1.6 ft.
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10
|
Limonite and bentonite
|
0.1 ft.
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9
|
Gray chalk
|
2.5 ft.
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8
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Limonite
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0.025 ft.
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7
|
Gray chalk
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3.5 ft.
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6
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Limonite and bentonite
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0.1 ft.
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5
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Gray chalk
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3.3 ft.
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4
|
Limonite and bentonite
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0.025 ft.
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3
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Gray chalk
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1.6 ft.
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2
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Limonite and bentonite
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0.1 ft.
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|
1
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Gray chalk
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2 ft.
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