Abstract
Research Article| February 01, 1959 UPPER DEVONIAN UNCONFORMITY IN CENTRAL UTAH J KEITH RIGBY J KEITH RIGBY DEPARTMENT OF GEOLOGY, BRIGHAM YOUNG UNIVERSITY, PROVO, UTAH Search for other works by this author on: GSW Google Scholar GSA Bulletin (1959) 70 (2): 207–218. https://doi.org/10.1130/0016-7606(1959)70[207:UDUICU]2.0.CO;2 Article history received: 07 Apr 1958 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation J KEITH RIGBY; UPPER DEVONIAN UNCONFORMITY IN CENTRAL UTAH. GSA Bulletin 1959;; 70 (2): 207–218. doi: https://doi.org/10.1130/0016-7606(1959)70[207:UDUICU]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 Rocks equivalent to the upper Devonian Pinyon Peak limestone and Victoria quartzite occur unconformably above older rock units in central and east-central Utah. This unconformity is perhaps most profound in the Stansbury Range where Pinyon Peak limestone overlies rocks as old as the upper part of the Tintic quartzite and as young as Simonson dolomite. A thick conglomerate occurs below the Pinyon Peak formation at the northern end of the range, and the conglomerate rests upon rocks as young as the Lake-town dolomite. To the south the conglomerate is thin and rests upon lower Simonson dolomite.Pinyon Peak limestone overlies Victoria quartzite which is disconformable upon Simonson dolomite. A similar but much thicker arenaceous unit is exposed on Stansbury Island north of the core of the uplift.The unconformity is present in the Oquirrh and southern Wasatch Mountains where Mississippian rocks rest unconformably upon Upper and Middle Cambrian units and generally rest lower in the section from southwest to northeast. Ophir shale, exposed below the Mississippian and lenticular Devonian rocks in the Central Wasatch southeast of Salt Lake City, represents an area of deep erosion. Northeast of Salt Lake City, the unconformity is at the base of the Upper Devonian clastic unit within the Three Forks or Jefferson formations. Younger rocks appear beneath the unconformity toward the north; a nearly complete and normal section occurs in the vicinity of Logan in the northeastern corner of the state.The thick conglomerate of the Stansbury Range and the more widespread Upper Devonian sandstone, siltstone, shale, and silty carbonate units were probably derived from erosion of the uplifted area. Erosion, not nondeposition, probably accounts for much of the stratigraphic gap immediately below uppermost Devonian and lowermost Mississippian –rocks in the central part of Utah. 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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
