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Colorado River Raft Tour - columnar jointing

By Geology and Ecology of National Parks
This is a photo of columnar jointing in a Quaternary basalt flow & the cliff of the Redwall Limestone.
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Detailed Description

~ Mile 186.5: Looking up at columnar jointing in a Quaternary basalt flow and the cliff of the Redwall Limestone on the north side of the canyon.

Sources/Usage

Public Domain.