Once layers of sand were deposited in desert dunes. Later they were covered by other materials, they petrified and surfaced again when the Colorado Plateau was uplifted and then eroded.
[USA.UTAH 7714]
'Above Paria Canyon.'
Once layers of sand were deposited in desert dunes. Later they were covered by other materials, they petrified and surfaced again when the Colorado Plateau was uplifted and then eroded.
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