TY - RPRT TI - A study of the Cretaceous-Tertiary unconformity in the Piceance Creek basin, Colorado; the underlying Ohio Creek Formation (Upper Cretaceous) redefined as a member of the Hunter Canyon or Mesaverde Formation AU - Ronald C. Johnson AU - Fred E. May PY - 1980 DO - 10.3133/b1482b UR - https://pubs.usgs.gov/publication/b1482B ID - b1482B ER -