Results: 1 - 3 of 3
Jan 23, 2020
Data
… quartzite, other stones, clay, shale, salt, potash, gypsum, sodium …
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 …