TY  - RPRT
TI  - Updated tops file for Cretaceous and lower Tertiary units, Piceance Basin, northwest Colorado
AU  - Ronald C. Johnson
AU  - John D. Dietrich
AU  - Tracey J. Mercier
PY  - 2015
DO  - 10.3133/ofr20151036
UR  - https://pubs.usgs.gov/publication/ofr20151036
ID  - ofr20151036
ER  -