Results: 1 - 4 of 4
Apr 30, 2012
Open File Report
… by sulphur-stained, dark grey shale of the Westgate Formation. A … bentonite units in the otherwise shale-dominated Fish Scales … the Belle Fourche Formation is shale dominated with silty lenses, …
Jan 23, 2020
Data
… quartzite, other stones, clay, shale, salt, potash, gypsum, sodium …
Sep 26, 2017
Open File Report
… Pliensbachian for the Poker Chip Shale, late Aalenian for the Rock …