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Colorado River Raft Tour - volcanic sill exposed along the north bank

By Geology and Ecology of National Parks
This is a photo of a large Precambrian-age volcanic sill exposed along the north bank of the river.
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Detailed Description

~ Mile 133.5: View downstream of a large Precambrian-age (Middle Proterozoic) volcanic sill (Cardenas Lava) exposed along the north bank of the river.

Sources/Usage

Public Domain.