Geology

Illustrated canyon grotto with a host observing wetland plants beside a protected habitat inset and ancient bedrock

Elves Chasm: The Camping Rule and the Delisted Snail

Elves Chasm has a camping closure, protected wetland plants, a snail delisted for taxonomy rather than recovery, and some of the canyon’s oldest rock.

Labeled cutaway cross-section of a canyon cliff showing a breccia pipe: an ancient collapsed cave on one side filling with ore, a modern mine shaft cut into it on the other, with the host examining both halves.

Grand Canyon Underground: How Caves, Mines and Bats Connect

Karst geology links the park’s caves and its uranium mines directly: many ore-bearing breccia pipes are collapsed ancient caves, excavated twice over.

Cutaway illustration of the wide, shallow limestone cavern at River Mile 33 with the Colorado River curving past its mouth, labeled with rock layers and fossils

Redwall Cavern: the river-carved amphitheater that isn't a cave

A limestone alcove at River Mile 33 that Powell guessed could seat 50,000 people — day-use only, no camping, and not legally a cave.