TY  - RPRT
TI  - Petrographic data from the Lower Cretaceous Blackleaf Formation and lower Upper Cretaceous Frontier Formation (lower part) in Beaverhead and Madison counties, Montana
AU  - T. S. Dyman
PY  - 1985
DO  - 10.3133/ofr85592
UR  - https://pubs.usgs.gov/publication/ofr85592
ID  - ofr85592
ER  -