Grand Canyon-Parashant National Monuement is located at the junction of two physiographic provinces, the Colorado Plateau and Basin and Range. Sedimentary rock layers are relatively undeformed and unobscured by vegetation. Deep canyons, mountains, and lonely buttes testify to the power of geologic forces. Geologic faults range from over six million years to much newer faults of only 30,000 years. Parashant's landscape has been volcanically active for over five million years. Several of Parashant's lava flows have dammed the Colorado River in the Grand Canyon. The most recent eruption in Parashant was a mere 1,075 years ago.
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Last updated: November 1, 2022