These rounded basalt boulders – about the size of suitcases – are glacial erratics, rocks carried by glaciers and dropped behind as the glacier retreats.

The erratics come from a basalt highland about 2500 feet higher in elevation and six miles north. Located in the Escalante Canyons region of Utah, United States.

The sandstone is the Navajo formation. The typical lineations in Navajo sandstone are from crossbedding. At this spot, the long striations are from glacial scouring.