TY - RPRT TI - 40Ar/39Ar age-spectrum data of Neogene and younger basalts in west central Colorado AU - Michael J. Kunk AU - Lawrence W. Snee PY - 1998 DO - 10.3133/ofr98243 UR - https://pubs.usgs.gov/publication/ofr98243 ID - ofr98243 ER -