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The Quaternary stratigraphy of southwest Sable Island Bank, eastern Canada

1990; Geological Society of America; Volume: 102; Issue: 7 Linguagem: Inglês

10.1130/0016-7606(1990)102 2.3.co;2

1943-2674

Carl L. Amos, Ann A. L. Miller,

Geological Studies and Exploration

Research Article| July 01, 1990 The Quaternary stratigraphy of southwest Sable Island Bank, eastern Canada CARL L. AMOS; CARL L. AMOS 1Geological Survey of Canada, Bedford Institute of Oceanography, P.O. Box 1006, Dartmouth, Nova Scotia, B2Y 4A2 Search for other works by this author on: GSW Google Scholar ANN A.L. MILLER ANN A.L. MILLER 2Department of Geology, George Washington University, 2029 G Street NW, Washington, D. C. 20052 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1990) 102 (7): 915–934. https://doi.org/10.1130/0016-7606(1990)102 2.3.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation CARL L. AMOS, ANN A.L. MILLER; The Quaternary stratigraphy of southwest Sable Island Bank, eastern Canada. GSA Bulletin 1990;; 102 (7): 915–934. doi: https://doi.org/10.1130/0016-7606(1990)102 2.3.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 Three boreholes, ten vibrocores, and high-resolution seismic reflection records were analyzed to reconstruct the stratigraphy of the topmost 50 m of the sedimentary column of southwest Sable Island Bank. The sequence is complex owing to the effects of two low stands of sea level, two periods of ice influence, and two periods of open water during the past 40,000 yr. A low stand at -98 m occurred at 28,000 to 32,000 yr B.P.; a second low stand occurred at -110 m between 13,000 and 15,000 yr B.P. Ice covered the region prior to 32,000 yr B.P. and from 11,000 to 10,000 yr B.P. Open water prevailed at other times. The sequence of sediments follows the formational subdivision of King and the member subdivision of Amos and Knoll. The Sable Island Sand and Gravel Formation is subdivided into three members: trough-bedded sand, cross-bedded sand, and conformably bedded sand. The conformably bedded sand formed under heavy sea ice and represents the Younger Dryas event. The uppermost two members result from shelf sediment reworking. The Emerald Silt Formation is subdivided into four members: channel gravel, upper stratified sand/fines, barren gravelly/sand, and lower stratified sand/fines and two regional discontinuities, R1 and R2. The coarser-grained facies of the channel gravel and barren gravelly/sand members are the result of reworking during late and mid-Wisconsinan transgressions of Sable Island Bank. The upper stratified sand/fines member is interpreted as an open-water marine deposit formed during the Scotian Stade. The lower stratified sand/fines member is interpreted as a glacio-marine deposit formed during the Digby Stade. 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.