Supplemental material: Sr Isotope Evidence for a Lacustrine Origin for the Upper Miocene to Pliocene Bouse Formation, Lower Colorado River Trough, and Implications for Timing of Colorado Plateau Uplift SpencerJon E. 1997 GSA Data Repository Item 9722, GSA Bulletin, Vol. 109, p. 767. File size: 6 p., about 193 K bytes.