STRATIGRAPHY AND STRUCTURE OF THE ST. ALBANS AREA, NORTHWESTERN VERMONT
1958; Geological Society of America; Volume: 69; Issue: 5 Linguagem: Inglês
10.1130/0016-7606(1958)69[519
ISSN1943-2674
Autores Tópico(s)Geochemistry and Geologic Mapping
ResumoResearch Article| May 01, 1958 STRATIGRAPHY AND STRUCTURE OF THE ST. ALBANS AREA, NORTHWESTERN VERMONT ALAN B SHAW ALAN B SHAW SHELL OIL COMPANY, 1845 SHERMAN STREET, DENVER 3, COLORADO Search for other works by this author on: GSW Google Scholar Author and Article Information ALAN B SHAW SHELL OIL COMPANY, 1845 SHERMAN STREET, DENVER 3, COLORADO 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 (5): 519–567. https://doi.org/10.1130/0016-7606(1958)69[519:SASOTS]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 ALAN B SHAW; STRATIGRAPHY AND STRUCTURE OF THE ST. ALBANS AREA, NORTHWESTERN VERMONT. GSA Bulletin 1958;; 69 (5): 519–567. doi: https://doi.org/10.1130/0016-7606(1958)69[519:SASOTS]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 The Cambro-Ordovician sequence in northwestern Vermont includes two Lower Cambrian formations, Dunham Dolomite and Gilman Quartzite; Parker Slate is both Lower and Middle Cambrian, and Rugg Brook Dolomite is Middle Cambrian. Six formations of the Woods Corners Group (new name) are tentatively assigned to the upper Middle Cambrian because accepted evidence demonstrates that the Cedaria zone (lower Dresbachian) correlates with the standard Middle Cambrian of Europe rather than with the Upper Cambrian. The Upper Cambrian (post-Dresbachian), Lower Ordovician, and Middle (?) Ordovician are each represented by one formation: Gorge and Highgate formations and Morses Line Slate, respectively. The old names Georgia Slate, Mallett Formation, Winooski Dolomite, Russell Slate and Grandge Slate are abandoned; the Corliss Conglomerate is regarded as a member of the Morses Line Slate, and nearly all formations are substantially redefined. The faunas of each formation are listed and reviewed.Structurally, the St. Albans area, which is basically a large northward-plunging syncline, is part of the Rosenberg thrust slice of Clark. East of the Champlain thrust six additional thrusts (four newly described) are recognized and cut the northern part of the area into five imbricated thrust slices. Minor folding and the flow cleavage are related to the major syncline rather than to the thrusting, although it is believed that the thrusting was a late stage in the same period of deformation that began with the synclinal folding. One tear fault seems to be genetically related to the minor folding.Eight interformational unconformities and at least as many intraformational unconformities, particularly in the Ordovician, point out the structural instability of the St. Albans area in Cambro-Ordovician time. The predominance of slate contrasts to the carbonate-quartzite sequence to the south in the Hinesburg and Middlebury synclinoria. Sedimentary evidence suggests both northwestern and southwestern sources for the sands in the area. 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.
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