Research Article| June 01, 1963 ORDOVICIAN-SILURIAN RELATIONS ON NEW WORLD ISLAND, NOTRE DAME BAY, NORTHEAST NEWFOUNDLAND* MARSHALL KAY; MARSHALL KAY DEPT. GEOLOGY, COLUMBIA UNIVERSITY, NEW YORK, N.Y.; GEOLOGICAL SURVEY OF CANADA, OTTAWA, ONTARIO, CANADA Search for other works by this author on: GSW Google Scholar HAROLD WILLIAMS HAROLD WILLIAMS DEPT. GEOLOGY, COLUMBIA UNIVERSITY, NEW YORK, N.Y.; GEOLOGICAL SURVEY OF CANADA, OTTAWA, ONTARIO, CANADA Search for other works by this author on: GSW Google Scholar Author and Article Information MARSHALL KAY DEPT. GEOLOGY, COLUMBIA UNIVERSITY, NEW YORK, N.Y.; GEOLOGICAL SURVEY OF CANADA, OTTAWA, ONTARIO, CANADA HAROLD WILLIAMS DEPT. GEOLOGY, COLUMBIA UNIVERSITY, NEW YORK, N.Y.; GEOLOGICAL SURVEY OF CANADA, OTTAWA, ONTARIO, CANADA Publisher: Geological Society of America First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1963, 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 (1963) 74 (6): 807–808. https://doi.org/10.1130/0016-7606(1963)74[807:ORONWI]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 MailTo Tools Icon Tools Get Permissions Search Site Citation MARSHALL KAY, HAROLD WILLIAMS; ORDOVICIAN-SILURIAN RELATIONS ON NEW WORLD ISLAND, NOTRE DAME BAY, NORTHEAST NEWFOUNDLAND. GSA Bulletin 1963;; 74 (6): 807–808. doi: https://doi.org/10.1130/0016-7606(1963)74[807:ORONWI]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 Ordovician and Silurian rocks crop out in two main fault-separated belts in eastern New World Island, Notre Dame Bay, Newfoundland. Along Cobbs Arm on the northeast coast, the Ordovician of the northern belt, with tops facing north, has hundreds of feet of lava, agglomerate, and fragmental volcanic rocks with lenses of Maclurites-bearing limestone. Overlying are about 100 feet of calcarenite, and of siliceous argillite with upper Caradocian-Trentonian graptolites, locally repeated. The basal Silurian, 100 feet of argillite with Llandoverian brachiopods and corals, lies on the limestone and siliceous argillite along and east of Rogers Cove; pebbles of the latter rocks are common in the lower part, and a few pebbly lenses have fragments of plutonic rocks as well. The Silurian has thousands of feet of north-facing graywacke, silty argillite, and polymictic conglomerate in the main belts south and north of Cobbs Arm. Sole markings on the lower graywacke beds have a dominant north trend in widely scattered localities on the island; to the north at Herring Neck, Silurian conglomerate (Goldson) has boulders to a foot in diameter, diminishing westward. In western New World Island at Intricate Harbour, Ordovician lavas and cherts are succeeded by several hundred feet of argillite, then by bedded conglomerate (“Hornet”) containing brachiopods in the base that seem to be late Ordovician Cincinnatian or Ashgillian. The main belts seem to be separated by a high-angle fault, but the northerly belt may have been thrust northward over the southerly one, and the fault subsequently tilted northward; thus the rocks in the northerly belt may have been most southerly at deposition. 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.