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TitlePalaeogeography of Atlantic Canada 13-0 kyr
AuthorShaw, J; Gareau, P; Courtney, R C
SourceQuaternary Science Reviews vol. 21, 2002 p. 1861-1878, (Open Access)
LinksAbstract - Résumé
Alt SeriesGeological Survey of Canada, Contribution Series 2000300
PublisherElsevier BV
Mediapaper; on-line; digital
File formatpdf
ProvinceNewfoundland and Labrador; New Brunswick; Nova Scotia; Prince Edward Island; Quebec
NTS1; 2C; 2D; 2E; 2F; 2L; 10; 11; 12A; 12B; 12C; 12D; 12E; 12F; 12G; 12H; 12I; 12J; 12K; 12L; 20; 21A; 21B; 21F; 21G; 21H; 21I; 21J; 21K; 21N; 21O; 21P; 22A; 22B; 22C; 22F; 22G; 22H; 22I; 22J; 22K
Lat/Long WENS -70.0000 -47.0000 51.0000 41.0000
Subjectsmarine geology; coastal environment; coastal studies; sea level changes; sea level fluctuations; Holocene; paleogeography; continental shelf; paleo-sea levels
Illustrationslocation maps; tables; geological sketch maps; graphs
AbstractWe combine isobase maps with a digital terrain model of Atlantic Canada to map coastlines from 13 14Ckyr BP to the present. At 13 14Ckyr BP there are ridges of high relative sea level (rsl) values over Newfoundland and the Maritime Provinces, and a re-entrant of low values in the Gulf of St. Lawrence. This pattern persists well into the Holocene, and reflects crustal response to the slow wasting of ice caps that persisted in Newfoundland and the Maritime Provinces for up to five millennia after the removal of ice from the Gulf of St. Lawrence by a migrating calving embayment. The palaeogeographic reconstructions reveal an archipelago on the outer shelf, from Grand Bank to the continent, that persisted from >13 14Ckyr BP until ca. 8 14Ckyr BP. Much of the Magdalen Shelf was exposed, but the Magdalen Islands were never connected to the mainland. Prince Edward Island was initially separated from the mainland, became connected after 11 14Ckyr BP, and was separated again just before 6 14Ckyr BP, when Northumberland Strait formed. The reconstructions are highly sensitive to relatively small changes in isobase values, especially on the shallow banks on the continental shelf.

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