STRATIGRAPHY AND STRUCTURE OF THE COPAKE QUADRANGLE, NEW YORK

Abstract

Research Article| June 01, 1957 STRATIGRAPHY AND STRUCTURE OF THE COPAKE QUADRANGLE, NEW YORK JOHN DODSWORTH WEAVER JOHN DODSWORTH WEAVER UNIV. DE PUERTO RICO, MAYAGUEZ, P. R. Search for other works by this author on: GSW Google Scholar GSA Bulletin (1957) 68 (6): 725–761. https://doi.org/10.1130/0016-7606(1957)68[725:SASOTC]2.0.CO;2 Article history received: 22 Jun 1954 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation JOHN DODSWORTH WEAVER; STRATIGRAPHY AND STRUCTURE OF THE COPAKE QUADRANGLE, NEW YORK. GSA Bulletin 1957;; 68 (6): 725–761. doi: https://doi.org/10.1130/0016-7606(1957)68[725:SASOTC]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The area of the Copake, New York, quadrangle lies centrally in what has been described formerly as a klippe of a large overthrust sheet of Cambro-Ordovician argillaceous rocks, thrust westward about 40 miles over carbonate rocks of similar age. The argillaceous rocks are divisible into an older (Late Cambrian to Early Ordovician) group, here named the Elizaville shales, and a younger group of Trentonian shales lying unconformably above the Elizaville shales and the Cambro-Ordovician carbonate rocks. A thin limestone at the base of the Trenton shales wedges out westward.The structure is imbricate. Most faulting was pre-Trenton; further movement involving the Trenton rocks has occurred mainly along faults in the underlying rocks. No evidence supports the klippe hypothesis, and the facies changes which engendered it can be explained as associated with offshore reef-girt islets or perhaps back-reef conditions.The Berkshire schist in the eastern edge of the quadrangle is the metamorphosed equivalent of the Trentonian shales. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.