Twin Sisters

Quick Facts

Amenities

1 listed

Scenic View/Photo Spot

Twins in size but not in age; the south Sister formed from the Green Creek Granite (as old as 2.5 billion years) and the north Sister formed from Almo Pluton Granite (28 million years old). The Sisters rise majestically 750 feet above the basin floor. The twin pinnacles were a landmark along the California Trail. Addison Pratt an officer with the Mormon Battalion returning from California named the formation on September 15, 1848. 

For more geologic information about the Twin Sisters check out the Geological Interpretive Trail guide in the Self-Guided Tours section on the City of Rocks NPS Mobile App or pick up a copy at our Visitor Center.