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You are browsing the archive for 2012 July 27.

27 July 2012

Friday fold: Spray Mountain Group siltstone

Today, we return to Banff National Park, to the outcrops next to the parking area for Bow River Falls… Zoomed-in closer to the thinner layers at left: These strata (shale and siltstone) were laid down in the quiet aftermath of the Permo-Triassic extinction, as terranes colliding with the edge of North America (far to the west) began shedding clastic sediment into the basin to the east. The lack of critters …

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