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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