Results: 1 - 4 of 4
Apr 13, 2008
Special Report
Dec 31, 1957
Bulletin
… the lower part of the Colorado shale of Alberta and Saskatchewan, and in the Mowry shale of the Black Hills area of …
Feb 29, 2008
Special Report
… by at least one contiguous thick shale sequence, the Smoky Group. …
Dec 31, 1970
Earth Sciences Report