Age and Origin of the White Mesa Alluvium, Northeastern Arizona: Geosphere, V
Research Paper THEMED ISSUE: CRevolution 2: Origin and Evolution of the Colorado River System II GEOSPHERE Reevaluation of the Crooked Ridge River—Early Pleistocene (ca. 2 Ma) age and origin of the White Mesa alluvium, northeastern GEOSPHERE; v. 12, no. 3 Arizona doi:10.1130/GES01124.1 Richard Hereford1, L. Sue Beard1, William R. Dickinson2, Karl E. Karlstrom3, Matthew T. Heizler4, Laura J. Crossey3, Lee Amoroso1, P. Kyle House1, 14 figures; 3 tables; 3 supplemental files and Mark Pecha5 1U.S. Geological Survey, 2255 N. Gemini Drive, Flagstaff, Arizona 86001, USA CORRESPONDENCE: rhereford@ usgs .gov 2Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA 3Department of Earth and Planetary Sciences, University of New Mexico, 221 Yale Boulevard NE, Albuquerque, New Mexico 87106, USA 4New Mexico Geochronology Research Laboratory, New Mexico Bureau of Geology & Mineral Resources–New Mexico Institute of Mining & Technology, 801 Leroy Place, Socorro, New Mexico CITATION: Hereford, R. Beard, L.S., Dickinson, 87801, USA W.R., Karlstrom, K.E., Heizler, M.T., Crossey, L.J., 5Arizona Laserchron Center, Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA Amoroso, L., House, P.K., and Pecha, M., 2016, Re- evaluation of the Crooked Ridge River—Early Pleis- tocene (ca. 2 Ma) age and origin of the White Mesa alluvium, northeastern Arizona: Geosphere, v. 12, no. 3, p. 768–789, doi:10.1130/GES01124.1. ABSTRACT older than inset gravels that are interbedded with 1.2–0.8 Ma Bishop–Glass Mountain tuff. The new ca. 2 Ma age for the White Mesa alluvium refutes the Received 27 August 2014 Essential features of the previously named and described Miocene Crooked hypothesis of a large regional Miocene(?) Crooked Ridge paleoriver that pre- Revision received 12 November 2015 Ridge River in northeastern Arizona (USA) are reexamined using new geologic dated carving of the Grand Canyon.
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