TY - RPRT TI - Isotopic age of the Black Forest Bed, Petrified Forest Member, Chinle Formation, Arizona: An example of dating a continental sandstone AU - N. R. Riggs AU - S.R. Ash AU - A. P. Barth AU - G. E. Gehrels AU - J. L. Wooden PY - 2003 DO - 10.1130/b25254.1 UR - https://pubs.usgs.gov/publication/70024975 ID - 70024975 ER -