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Stratigraphy and sedimentology of the Pennsylvanian Grande Anse Formation, Cumberland Basin, Eastern Canada; its relationship to salt tectonics and coeval strata of the Joggins World Heritage site

Fadel Bahr and Dave Keighley
Stratigraphy and sedimentology of the Pennsylvanian Grande Anse Formation, Cumberland Basin, Eastern Canada; its relationship to salt tectonics and coeval strata of the Joggins World Heritage site
Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre (March 2021) 58 (3): 209-224

Abstract

The Cumberland Basin is one of several sedimentary basins composing the late Paleozoic Maritimes Basin complex of eastern Canada. Pennsylvanian salt tectonics in the Cumberland Basin caused two salt mini-basins to evolve on either side of the Minudie Anticline, a salt wall. South of the wall (Athol Syncline), along the Joggins World Heritage shoreline, an approximately 3000 m succession of strata (Little River, Joggins, Springhill Mines, and Ragged Reef formations) accumulated conformably on the Boss Point Formation. North of the wall (Black Point sub-basin), the biostratigraphically equivalent, but mostly unstudied, approximately 600 m thick succession of Grande Anse Formation lies in angular unconformity on folded and faulted Boss Point and basal Little River formations. Grande Anse Formation sedimentology indicates four lithofacies associations: floodplain (LA1), braided channel (LA2), sheet flood (LA3), and debris flow deposits (LA4). One possible model has the Black Point sub-basin with its own hydrological system, completely separated from the Athol Syncline. A low subsidence rate combined with the low sedimentation rate produced the approximately 600 m thick sand- and mud-prone succession that was contemporaneous with the approximately 3 km succession to the south. The second model proposes that north of the salt wall was exposed to erosion during accumulation of Joggins and Springhill Mines formation strata to the south. Subsequently, the sediment of the lithologically similar Ragged Reef and Grande Anse formations either (i) onlapped to the north, unconformably on the folded Boss Point; or (ii) unconformably-disconformably on the underlying strata after a period of time indistinguishable in the biostratigraphic record.


ISSN: 0008-4077
EISSN: 1480-3313
Coden: CJESAP
Serial Title: Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre
Serial Volume: 58
Serial Issue: 3
Title: Stratigraphy and sedimentology of the Pennsylvanian Grande Anse Formation, Cumberland Basin, Eastern Canada; its relationship to salt tectonics and coeval strata of the Joggins World Heritage site
Affiliation: University of New Brunswick, Department of Earth Sciences, Fredericton, NB, Canada
Pages: 209-224
Published: 202103
Text Language: English
Summary Language: French
Publisher: National Research Council of Canada, Ottawa, ON, Canada
References: 64
Accession Number: 2021-050429
Categories: StratigraphyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps, strat. cols., 2 tables, sect.
N45°40'00" - N45°46'00", W64°30'00" - W64°19'60"
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from Canadian Science Publishing, NRC Research Press, Ottawa, ON, Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202116
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