TY  - RPRT
TI  - Chemical composition, stratigraphy, and depositional environments of the Black River Group (Middle Ordovician), southwestern Ohio.
AU  - David A. Stith
PY  - 1981
DO  - 10.1130/0016-7606(1981)92<629:ccsade>2.0.co;2
UR  - https://pubs.usgs.gov/publication/70011948
ID  - 70011948
ER  -