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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 …