Nov 18, 2008
Data
… analyses of 57 mudstone, 29 shale, 13 ironstone, 6 pyrite …
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 …