Stratigraphy of the Cow Head Region, Western Newfoundland

Research Article| March 01, 1958 STRATIGRAPHY OF THE COW HEAD REGION, WESTERN NEWFOUNDLAND C. H KINDLE; C. H KINDLE CITY COLLEGE OF NEW YORK, NEW YORK 31, NEW YORK MUSEUM OF COMPARATIVE ZOOLOGY, CAMBRIDGE 38, MASSACHUSETTS Search for other works by this author on: GSW Google Scholar H. B WHITTINGTON H. B WHITTINGTON CITY COLLEGE OF NEW YORK, NEW YORK 31, NEW YORK MUSEUM OF COMPARATIVE ZOOLOGY, CAMBRIDGE 38, MASSACHUSETTS Search for other works by this author on: GSW Google Scholar Author and Article Information C. H KINDLE CITY COLLEGE OF NEW YORK, NEW YORK 31, NEW YORK MUSEUM OF COMPARATIVE ZOOLOGY, CAMBRIDGE 38, MASSACHUSETTS H. B WHITTINGTON CITY COLLEGE OF NEW YORK, NEW YORK 31, NEW YORK MUSEUM OF COMPARATIVE ZOOLOGY, CAMBRIDGE 38, MASSACHUSETTS Publisher: Geological Society of America First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1958, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1958) 69 (3): 315–342. https://doi.org/10.1130/0016-7606(1958)69[315:SOTCHR]2.0.CO;2 Article history First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation C. H KINDLE, H. B WHITTINGTON; STRATIGRAPHY OF THE COW HEAD REGION, WESTERN NEWFOUNDLAND. GSA Bulletin 1958;; 69 (3): 315–342. doi: https://doi.org/10.1130/0016-7606(1958)69[315:SOTCHR]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 Seashore exposures in the Cow Head area display a succession of limestone conglomerates interbedded with shales and limestones. Conglomerate layers range in thickness from 1 foot to more than 200 feet. The material consists of flat angular chips or moderately rounded boulders of fine-grained gray or white limestone. Fossiliferous boulders from any one layer yield trilobites of the same limited age.Boulders from the lowest fossiliferous conglomerate at Broom Point contain Kootenia, Zacanthoides, Orriella, Agraulos, and Peronopsis. Succeeding bedded limestone yields Meneviella and Tomagnostus. A boulder in the overlying conglomerate also contained Meneviella and Tomagnostus.Cambrian conglomerates at Cow Head yield younger trilobites in successive layers: Tricrepicephalus appears in the lower, then Taenicephalus, followed by Ctenopyge, Rasettia, and Keithiella. Above are beds with Staurograptus and Dictyonema, overlain by conglomerates with early Ordovician trilobites.Successively higher black shales contain graptolites of the Levis Shale zones, and interbedded conglomerates yield successively younger Ordovician trilobites. Shale with Trigonograptus and Isograptus underlies the highest conglomerate which yields Nileus, Bathyurellus, Remopleurides, and Ectenonotus. The thick limestone conglomerate at Lower Head includes enormous boulders, one of which contains many of the trilobites described by Billings (1861–1865) as from Cow Head. This layer is underlain by black shale with Isograptus.The Cow Head Group, therefore, is not a single formation but a succession of conglomerates and intervening beds ranging in age from Middle Cambrian to Middle Ordovician. With few exceptions the boulders of any conglomerate are approximately the same age as the immediately underlying strata. The limestones of the fossiliferous boulders formed in shallow water; the beds intervening between the conglomerate layers formed in deeper water and consequently are almost devoid of fossils other than graptolites. 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.