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MINIMUM AGE OF MIDDLE ORDOVICIAN ROCKS IN SOUTHERN QUEBEC

1963; Geological Society of America; Volume: 74; Issue: 8 Linguagem: Inglês

10.1130/0016-7606(1963)74[1063

1943-2674

William Poole, Jacques Béland, R. K. Wanless,

Pleistocene-Era Hominins and Archaeology

Research Article| August 01, 1963 MINIMUM AGE OF MIDDLE ORDOVICIAN ROCKS IN SOUTHERN QUEBEC W. H POOLE; W. H POOLE GEOLOGICAL SURVEY OF CANADA, OTTAWA, ONTARIO, CANADA Search for other works by this author on: GSW Google Scholar J BÉLAND; J BÉLAND DEPT. GEOLOGY, UNIVERSITY OF MONTREAL, MONTREAL, QUEBEC, CANADA Search for other works by this author on: GSW Google Scholar R. K WANLESS R. K WANLESS GEOLOGICAL SURVEY OF CANADA, OTTAWA, ONTARIO, CANADA Search for other works by this author on: GSW Google Scholar GSA Bulletin (1963) 74 (8): 1063–1066. https://doi.org/10.1130/0016-7606(1963)74[1063:MAOMOR]2.0.CO;2 Article history received: 13 Mar 1963 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 W. H POOLE, J BÉLAND, R. K WANLESS; MINIMUM AGE OF MIDDLE ORDOVICIAN ROCKS IN SOUTHERN QUEBEC. GSA Bulletin 1963;; 74 (8): 1063–1066. doi: https://doi.org/10.1130/0016-7606(1963)74[1063:MAOMOR]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 K-Ar age determinations on muscovite from two granitic bodies provide a minimum date of 480 million years (m.y.) for the end of the late Middle Ordovician. The granitic bodies intruded ultramafic rocks that had intruded the Beauceville Group in the Thetford Mines-Black Lake area of southern Quebec. The Cambrian-Ordovician boundary may be dated at about 535 m.y., 35 m.y. earlier than Kulp's (1961) estimate. It follows that either the estimated duration of the Ordovician (Kulp, 1961) should be lengthened from 75 m.y. to 110 m.y., or the Ordovician-Silurian boundary is also 35 m.y. earlier, that is, about 460 m.y. ago. 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.