Big Snowy and Amsden Groups and the Mississippian-Pennsylvanian boundary in Montana,
"A study of the Upper Mississippian and Pennsylvanian sedimentary formations with special emphasis on their regional correlation, variation in lithology, and age assignments."
| Main Authors: | , |
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| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington,
U.S. Govt. Print. Off.,
1967.
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| Series: | Shorter contributions to general geology.
Geological Survey professional paper ; 554-B. |
| Subjects: |