TY  - RPRT
TI  - Geologic and biostratigraphic framework of the non-marine Cretaceous-Tertiary boundary interval in western North America
AU  - D. J. Nichols
PY  - 1990
DO  - 10.1016/0034-6667(90)90058-q
UR  - https://pubs.usgs.gov/publication/70016048
ID  - 70016048
ER  -