TY  - RPRT
TI  - The ages of the continental, Upper Cretaceous, Fruitland Formation and Kirtland Shale based on a projection of ammonite zones from the Lewis Shale, San Juan Basin, New Mexico and Colorado
AU  - James E. Fassett
PY  - 1987
DO  - 10.1130/spe209-p5
UR  - https://pubs.usgs.gov/publication/70207310
ID  - 70207310
ER  -