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15 October 2011

Cross-bedding in Flathead Sandstone, Wind River Canyon

This is a boulder of Cambrian-aged Flathead Sandstone, the unit overlying the Great Unconformity exposed in Wind River Canyon, Wyoming. Click to make it 5000 pixels wide. Swiss Army knife for scale. It shows a lovely example of multiple upside-down cross-beds. It also shows a heavy layer of caliche on what is (now) the upper surface – a phenomenon which typically occurs on the underside of sedimentary clasts. So not …


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