DescriptionPrecambrian - Cambrian Unconformity in Grand Canyon.jpg
English: Angular unconformity between horizontal Tonto Group rocks (of Cambrian age) on top of tilted Grand Canyon Supergroup rocks (1.1-1.2 Ga of Mesoproterozoic age) in the Grand Canyon, Arizona, USA. (Apollo Temple landform, below East Rim, north bank of Colorado River, near Unkar Creek(?).)
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