Center West line
Measured By H. Miller and E. Gutentag
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| Unit No. |
Description |
Thickness |
|
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Niobrara
|
|
|
20
|
Hard, yellow chalk
|
4 ft.
|
|
19
|
Bentonite
|
0.05 ft.
|
|
18
|
Yellow chalk
|
2 ft.
|
|
17
|
Bentonite
|
0.05 ft.
|
|
16
|
Yellow chalk
|
0.1 ft.
|
|
15
|
Bentonite
|
0.05 ft.
|
|
14
|
Yellow chalk
|
3.3 ft.
|
|
13
|
Yellow chalk with calcite fills in fissures
|
27 ft.
|
|
12
|
Gypsum
|
0.05 ft.
|
|
11
|
Yellow chalk
|
0.8 ft.
|
|
10
|
Limonite and bentonite; gypsum
|
0.1 ft.
|
|
9
|
Yellow chalk
|
2.5 ft.
|
|
8
|
Limonite and bentonite; gypsum
|
0.1 ft.
|
|
7
|
Gray and yellow chalk
|
3 ft.
|
|
6
|
Bentonite and gypsum xls
|
0.2 ft.
|
|
5
|
Gray chalk
|
1 ft.
|
|
4
|
Bentonite; gypsum xls
|
0.05 ft.
|
|
3
|
Gray chalk
|
1.4 ft.
|
|
2
|
Bentonite and limonite; gypsum xls
|
0.1 ft.
|
|
1
|
Gray chalk, partly covered
|
7 ft.
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