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Colorado River Raft Tour - cliffs consisting of volcanic sill

By Geology and Ecology of National Parks
This is a photo of cliffs consisting of volcanic sill below Hakatai Shale exposed along the north bank of the river.
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Detailed Description

~ Mile 133.5: Late afternoon sun shines on cliffs consisting of a large Precambrian-age volcanic sill (Cardenas Lava) below red Hakatai Shale exposed along the north bank of the river.

Sources/Usage

Public Domain.