English: This image shows the Lewis Shale in a road cut in the type area, which is the La Plata Valley of Colorado. The Lewis Shale is a late Cretaceous formation, around 75 million years old, that records the final deposition of marine sediments in the Western Interior Seaway in the San Juan Basin.
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Captions
Lewis Shale in road cut in the type area, La Plata valley, Colorado