TY  - RPRT
TI  - Biostratigraphic zonation of the Park City Group
AU  - Bruce R. Wardlaw
AU  - James W. Collinson
PY  - 1977
DO  - 10.3133/ofr77853
UR  - https://pubs.usgs.gov/publication/ofr77853
ID  - ofr77853
ER  -