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GEOREF RECORD

Ordovician-Silurian stratigraphic framework, Macdonald Platform to Ospike Embayment transect, northeastern British Columbia

Leanne J. Pyle and Christopher R. Barnes
Ordovician-Silurian stratigraphic framework, Macdonald Platform to Ospike Embayment transect, northeastern British Columbia
Bulletin of Canadian Petroleum Geology (December 2001) 49 (4): 513-535

Abstract

Strata across a northeast-southwest platform-to-basin transect, northeastern British Columbia, record the tectonic evolution of the rifted margin of Laurentia from the Early Ordovician to Early Silurian. The transect spans over 70 km and contains facies transitions of the Macdonald Platform to the shelf-break and basinal facies of the Ospika Embayment, the southern extension of the Kechika Trough. Only the general stratigraphic framework is understood from previous regional mapping. This study provides detailed stratigraphic descriptions of platformal units that include the uppermost Kechika, Skoki, Beaverfoot and Nonda formations. A new platformal unit, the McCusker Formation, lies stratigraphically between the Beaverfoot and Nonda formations. Three new formations of the Road River Group, the Robb, Kenny and Laurier formations are transitional facies and off-shelf equivalents of the Beaverfoot, McCusker and Nonda formations. Two new members are recognized within the Robb Formation and formally named the Sidenius and Calnan members. Basinal facies of the Road River Group include the Ospika and Kwadacha formations. The abrupt lateral facies changes and occurrence of volcanics within the Skoki (platform) and Ospika (basinal) formations record renewed phases of extension of the continental margin in Ordovician and Silurian time. Throughout much of northwestern Alberta and northeastern British Columbia, the Ordovician-Silurian succession is missing beneath the sub-Devonian unconformity, and prominent unconformities punctuate the stratigraphic succession preserved in the study area. The detailed stratigraphic and conodont biostratigraphic work provides temporal constraints of platformal and slope units and scales of hiatuses during the early Paleozoic post-initial rift phase for this part of the Cordilleran margin of Laurentia.


ISSN: 0007-4802
Coden: BCPGAI
Serial Title: Bulletin of Canadian Petroleum Geology
Serial Volume: 49
Serial Issue: 4
Title: Ordovician-Silurian stratigraphic framework, Macdonald Platform to Ospike Embayment transect, northeastern British Columbia
Affiliation: University of Victoria, School of Earth and Ocean Sciences, Victoria, BC, Canada
Pages: 513-535
Published: 200112
Text Language: English
Summary Language: French
Publisher: Canadian Society of Petroleum Geologists, Calgary, AB, Canada
References: 52
Accession Number: 2002-048891
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. charts, strat. cols., sketch maps
N48°25'00" - N60°00'00", W139°00'00" - W114°00'00"
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute.
Update Code: 200216
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