Bright Angel and Eminence Faults, Eastern Grand Canyon, Arizona

Research Article| April 01, 1975 Bright Angel and Eminence Faults, Eastern Grand Canyon, Arizona PETER W. HUNTOON; PETER W. HUNTOON 1Department of Geology, University of Wyoming, Laramie, Wyoming 82071 Search for other works by this author on: GSW Google Scholar JAMES W. SEARS JAMES W. SEARS 1Department of Geology, University of Wyoming, Laramie, Wyoming 82071 Search for other works by this author on: GSW Google Scholar Author and Article Information PETER W. HUNTOON 1Department of Geology, University of Wyoming, Laramie, Wyoming 82071 JAMES W. SEARS 1Department of Geology, University of Wyoming, Laramie, Wyoming 82071 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1975) 86 (4): 465–472. https://doi.org/10.1130/0016-7606(1975)86<465:BAAEFE>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation PETER W. HUNTOON, JAMES W. SEARS; Bright Angel and Eminence Faults, Eastern Grand Canyon, Arizona. GSA Bulletin 1975;; 86 (4): 465–472. doi: https://doi.org/10.1130/0016-7606(1975)86<465:BAAEFE>2.0.CO;2 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 Bright Angel and Eminence faults trend northeastward for approximately 60 mi (100 km) through the eastern Grand Canyon region. The Bright Angel fault parallels basement foliation. Activity along the fault dates from Precambrian time. The first record of movement indicates that it was reverse; it coincided with the deposition of the basal Shinumo Quartzite. Additional reverse movement occurred following intrusion of the Unkar Group by diabase sills and dikes resulting in a total of as much as 1,300 ft (400 m) of displacement, east side up. The Precambrian Chuar Group was later broken by a series of northwest-trending normal faults that tilted the section toward the northeast, causing minor adjustments along the Bright Angel fault.Possible reverse movement along the Bright Angel fault is recorded in a local angular unconformity between the Paleozoic Redwall and Supai Formations. East-dipping Laramide (?) monoclines developed as reverse movement occurred along selected preexisting northwest-trending Precambrian faults. Tensional faulting beginning in Miocene (?) or Pliocene (?) time caused downfaulting, east side down, along the Bright Angel fault. The Eminence fault, west side down, is part of a graben complex. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.