Results: 1 - 3 of 3
Sep 26, 2017
Open File Report
… Pliensbachian for the Poker Chip Shale, late Aalenian for the Rock …
Dec 31, 1968
Earth Sciences Report
… a relatively impermeable marine shale, completely underlies the … beds of argillaceous sandstone, shale, and coal which immediately …
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 …