Jan 23, 2020
Data
… quartzite, other stones, clay, shale, salt, potash, gypsum, sodium …
Jan 23, 2020
Map
… elements, salt, sand/gravel, shale, silica sand, stone, sulphur, …
Sep 26, 2017
Open File Report
… Pliensbachian for the Poker Chip Shale, late Aalenian for the Rock …