 |
Unit No. |
Description |
Thickness ft. |
|
Wymore shale member |
|
28 |
Shale, gray, clayey |
3 |
27 |
Limestone, gray, tough |
0.8 |
26 |
Shale, massive, limy, gray, woith quartz geodes |
6 |
25 |
Shale, dark-gray |
1.4 |
24 |
Limestone |
0.1 |
23 |
Shale, limy |
1.5 |
|
Schroyer limestone member |
|
22 |
Limestone with quartz geodes and two thin flint bands;
crinoid joints |
1 |
21 |
Limestone, soft, with Dictyolcostus, Composita, Derbya,
and Rhombopora |
1.5 |
20 |
Limestone, light-gray, amssive, full of fragments of shells |
3 |
|
Havensville shale member |
|
19 |
Mudstone, massive, with quartz geodes and possibly with
poorly preserved pelecypods |
4.5 |
18 |
Mudstone, flaggy, with quartz geodes |
2.5 |
17 |
Mudstone, splittery |
2 |
16 |
Mudstone, with pebbles of shale |
1 |
15 |
Mudstone, splittery, softer toward the base |
7 |
14 |
Shale, clayey, green-gray |
8.2 |
13 |
Limestone, flaggy, with one thin flint band |
1 |
12 |
Limestoe, massive, with one thick flint band |
1 |
11 |
Limestone, massive, with thin flint band near the top
and thick flint band near the base |
2 |
10 |
Limestone, massive |
0.6 |
9 |
Shale |
0.2 |
8 |
Limestone, massive, with one flint band |
1 |
7 |
Shale [, calcareous] |
0.3 |
6 |
Flint |
1 |
|
Speiser shale formation |
|
5 |
Shale, splittery, dark-gray, black in the middle |
1 |
4 |
Mudstone, dark-gray |
0.3 |
3 |
Shale, black |
1 |
2 |
Shale, gray |
1 |
1 |
Limestone, light-gray |
1 |
|