Grand Canyon provenance for orthoquartzite clasts in the lower Miocene of coastal southern California Sabbeth, Leah ; Wernicke, Brian P. ; Raub, Timothy D. ; Grover, Jeffrey A. ; Lander, E. Bruce ; Kirschvink, Joseph L. Abstract Publication: Geosphere Pub Date: December 2019 DOI: 10.1130/GES02111.1 Bibcode: 2019Geosp..15.1973S