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High-precision U-Pb zircon geochronology of the Late Triassic Chinle Formation, Petrified Forest National Park (Arizona, USA): Temporal constraints on the early evolution of dinosaurs

2011; Geological Society of America; Volume: 123; Issue: 11-12 Linguagem: Inglês

10.1130/b30433.1

1943-2674

Jahandar Ramezani, Gregory D. Hoke, David E. Fastovsky, Samuel A. Bowring, François Therrien, S. I. Dworkin, Stacy C. Atchley, Lee C. Nordt,

Geological and Geochemical Analysis

Research Article| November 01, 2011 High-precision U-Pb zircon geochronology of the Late Triassic Chinle Formation, Petrified Forest National Park (Arizona, USA): Temporal constraints on the early evolution of dinosaurs Jahandar Ramezani; Jahandar Ramezani † 1Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139, USA †E-mail: ramezani@mit.edu Search for other works by this author on: GSW Google Scholar Gregory D. Hoke; Gregory D. Hoke 2Department of Earth Sciences, 204 Heroy Geology Laboratory, Syracuse University, Syracuse, New York 13244, USA Search for other works by this author on: GSW Google Scholar David E. Fastovsky; David E. Fastovsky 3Department of Geosciences, University of Rhode Island, 9 E. Alumni Ave., Kingston, Rhode Island 02881, USA Search for other works by this author on: GSW Google Scholar Samuel A. Bowring; Samuel A. Bowring 1Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139, USA Search for other works by this author on: GSW Google Scholar François Therrien; François Therrien 4Royal Tyrrell Museum of Palaeontology, P.O. Box 7500, Drumheller, Alberta T0J 0Y0, Canada Search for other works by this author on: GSW Google Scholar Steven I. Dworkin; Steven I. Dworkin 5Department of Geology, Baylor University, 101 Bagby Ave., Waco, Texas 76706, USA Search for other works by this author on: GSW Google Scholar Stacy C. Atchley; Stacy C. Atchley 5Department of Geology, Baylor University, 101 Bagby Ave., Waco, Texas 76706, USA Search for other works by this author on: GSW Google Scholar Lee C. Nordt Lee C. Nordt 5Department of Geology, Baylor University, 101 Bagby Ave., Waco, Texas 76706, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Jahandar Ramezani † 1Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139, USA Gregory D. Hoke 2Department of Earth Sciences, 204 Heroy Geology Laboratory, Syracuse University, Syracuse, New York 13244, USA David E. Fastovsky 3Department of Geosciences, University of Rhode Island, 9 E. Alumni Ave., Kingston, Rhode Island 02881, USA Samuel A. Bowring 1Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139, USA François Therrien 4Royal Tyrrell Museum of Palaeontology, P.O. Box 7500, Drumheller, Alberta T0J 0Y0, Canada Steven I. Dworkin 5Department of Geology, Baylor University, 101 Bagby Ave., Waco, Texas 76706, USA Stacy C. Atchley 5Department of Geology, Baylor University, 101 Bagby Ave., Waco, Texas 76706, USA Lee C. Nordt 5Department of Geology, Baylor University, 101 Bagby Ave., Waco, Texas 76706, USA †E-mail: ramezani@mit.edu Publisher: Geological Society of America Revision Received: 22 Feb 2011 Accepted: 04 Mar 2011 Received: 20 Oct 2011 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2011 Geological Society of America GSA Bulletin (2011) 123 (11-12): 2142–2159. https://doi.org/10.1130/B30433.1 Article history Revision Received: 22 Feb 2011 Accepted: 04 Mar 2011 Received: 20 Oct 2011 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Jahandar Ramezani, Gregory D. Hoke, David E. Fastovsky, Samuel A. Bowring, François Therrien, Steven I. Dworkin, Stacy C. Atchley, Lee C. Nordt; High-precision U-Pb zircon geochronology of the Late Triassic Chinle Formation, Petrified Forest National Park (Arizona, USA): Temporal constraints on the early evolution of dinosaurs. GSA Bulletin 2011;; 123 (11-12): 2142–2159. doi: https://doi.org/10.1130/B30433.1 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 SocietyGSA Bulletin Search Advanced Search Abstract The Triassic successions of the Colorado Plateau preserve an important record of vertebrate evolution and climate change, but correlations to a global Triassic framework are hampered by a lack of geochronological control. Tuffaceous sandstones and siltstones were collected from the Upper Triassic Chinle Formation exposed in the Petrified Forest National Park, Arizona, USA, within a refined stratigraphic context of 31 detailed measured sections. U-Pb analyses by the isotope dilution–thermal ionization mass spectrometry (ID-TIMS) method constrain maximum depositional ages for nine tuffaceous beds and provide new insights into the depositional history of the Chinle fluvial system. The base of the Blue Mesa Member of the Chinle Formation is placed at ca. 225 Ma, and the top of the Petrified Forest Member is placed at 208 Ma or younger, bracketing an ∼280-m-thick section that spans nearly the entire Norian Stage of the Late Triassic. Estimated sediment accumulation rates throughout the section reflect extensive hiatuses and/or sediment removal by channel erosion. The new geochronology for the Chinle Formation underscores the potential pitfalls of correlation of fluvial units based solely on lithostratigraphic criteria. A mid-Norian age (ca. 219–213 Ma) for the distinctive Sonsela conglomeratic sandstone bed constrains the Adamanian-Revueltian land vertebrate faunachron boundary. Our new data permit a significant time overlap between the lower Chinle sequence and the dinosauromorph-rich Ischigualasto Formation of northwestern Argentina. Near-contemporaneity of the trans-American deposits and their faunal similarities imply that early dinosaur evolution occurred rapidly across the Americas. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.