Early Pleistocene incision of the San Juan River, Utah, dated with 26Al and 10Be

Research Article| September 01, 2004 Early Pleistocene incision of the San Juan River, Utah, dated with 26Al and 10Be Amy J. Wolkowinsky; Amy J. Wolkowinsky 1Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907, USA Search for other works by this author on: GSW Google Scholar Darryl E. Granger Darryl E. Granger 1Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Amy J. Wolkowinsky 1Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907, USA Darryl E. Granger 1Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907, USA Publisher: Geological Society of America Received: 06 Feb 2004 Revision Received: 30 Apr 2004 Accepted: 04 May 2004 First Online: 03 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2004) 32 (9): 749–752. https://doi.org/10.1130/G20541.1 Article history Received: 06 Feb 2004 Revision Received: 30 Apr 2004 Accepted: 04 May 2004 First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Amy J. Wolkowinsky, Darryl E. Granger; Early Pleistocene incision of the San Juan River, Utah, dated with 26Al and 10Be. Geology 2004;; 32 (9): 749–752. doi: https://doi.org/10.1130/G20541.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Cosmogenic 26Al and 10Be in alluvial gravel on a strath 150 m above the San Juan River, Utah, reveal a depositional age of \(1.36\ ^{{+}0.20}\ _{{-}0.15}\) Ma. This gravel is correlative with a series of terraces that grade to Glen Canyon on the Colorado River, indicating a similar age for incision there. The calculated incision rate, 110 ± 14 m/m.y., is somewhat slower than that of the Colorado River in the eastern Grand Canyon and suggests active steepening of the Colorado River. The cosmogenic nuclides also indicate rapid erosion in the sediment source area and are consistent with alluviation due to enhanced Pleistocene erosion in the San Juan Mountains. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.