TY  - RPRT
TI  - Ordovician and Pennsylvanian berthierine-bearing flint clays
AU  - D.M. Moore
AU  - Randall E. Hughes
PY  - 2024
DO  - 10.1346/ccmn.2000.0480118
UR  - https://pubs.usgs.gov/publication/70022485
ID  - 70022485
ER  -