| Article 352, Stratigraphy of lower and middle parts of the Pierre Shale, northern Great Plains, pp. D185-D191, <In>, Geological Survey Research 1961, Short papers in the geologic and hydrologic sciences, articles 293-435 |
Gill, J.R.; and Cobban, W.A. |
U.S. Geological Survey, Professional Paper no. 424-D, 408 pages |
1961 |
N/A
|
| Stratigraphy and composition of the Sharon Springs Member of the Pierre Shale in western Kansas |
Gill, J.R.; Cobban, W.A.; and Schultz, L.G. |
U.S. Geological Survey, Professional Paper no. 728, 50 pages |
1972 |
N/A
|