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Geology; August 1993; v. 21; no. 8; p. 687-690; DOI: 10.1130/0091-7613(1993)021<0687:MCCPCS>2.3.CO;2
© 1993 Geological Society of America
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Middle Cambrian carbonate-platform collapse, southeastern Canadian Rocky Mountains

W. D. Stewart1, O. A. Dixon1 and B. R. Rustt1

1 University of Ottawa and Ottawa-Carleton Geoscience Centre, Ottawa, Ontario K1N 6N5, Canada

Regional erosion features, termed megatruncation surfaces, at the seaward margin of a Middle Cambrian carbonate platform in southeastern British Columbia, are inferred to be the proximal parts of gravity-slide scars comparable in scale and morphology to modern examples in the Caribbean region. The surfaces truncate up to 200 m of outer-platform strata and have low-angle to near-vertical headwalls. They can be traced a minimum of 56 km along depositional strike and appear to extend at least 8 km basinward of the platform edge. They therefore profoundly affect regional stratigraphy.




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