Grosvenor Arch, Grand Staircase-Escalante National Monument, Utah.
Ron Schott
June 26, 2015
Near Escalante National Monument, UT
37.456° N, 111.832° W
Grosvenor Arch, Grand Staircase-Escalante National Monument, Utah.
Dakota Formation37.458° N, 111.831° W
Capping the ridge, largely out of view from the camera's vantage point.
Entrada Sandstone37.458° N, 111.832° W
Tafoni weathering.
Henrieville Sandstone37.458° N, 111.834° W
Conglomerate at Butler Valley unconformably overlays the Henrieville Sandstone; may be Upper Jurassic(?).
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Entrada Sandstone37.458° N, 111.834° W
Conglomerate cap on aeolian sandstone.
Henrieville Sandstone37.458° N, 111.834° W
Festoon crossbeds in the Henrieville Sandstone member.
Grosvenor Arch is actually a double arch. The base of the arch is in the Entrada Sandstone. Locally, the uppermost Entrada is known as the Henrieville Sandstone. The arch is capped by the Conglomerate at Butler Valley. (Bowers, 1983; USGS Coal Investigations Map C-95)
