Geology of Amboy Crater

Hike to the rim of Amboy Crater and learn about dormant volcanoes in the Mojave Desert in this full-day geology lesson.

This is a moderate activity — fewer than 5 miles of walking, with multiple hours spent outdoors in the elements.

Alessandro Grippo, Ph.D. in Geological Sciences from the University of Southern California, has researched and taught geology, oceanography, stratigraphy, environmental geology, and field classes at Santa Monica College and several California State University campuses. Alessandro has a keen interest in the geology of the American Southwest and loves exploring, learning, and sharing his passion for Earth and its history.

Southern California is known for its trembling fault lines, quirky monzogranite outcroppings, and majestic mountains. But we’ve got other geological wonders, too, like volcanoes! One of the finest examples of a cinder cone you’ll ever come across is located right here in the Mojave Desert: Amboy Crater. Learn about this designated National Natural Landmark and other dormant volcanoes that stretch across the desert in this full-day geology lesson. Participants will experience endless lava fields and learn about the formation of the Swiss-cheese-like appearance of the rock as they hike the 4-mile round trip to the rim of the crater and back.

Participants must bring all required items for the course: 3 to 4 liters of water per person for a full-day outing, food and snacks, closed-toe athletic shoes, sun protection (hat, sunglasses, sunscreen), appropriate clothing, backpack, notebook, pencil, compass or GPS device, camera, binoculars, field guides, and a copy of *Roadside Geology of Southern California* by Arthur Gibbs Sylvester and Elizabeth O’Black Gans, available at Joshua Tree National Park Visitor Centers or joshuatree.org.

Photo credit: Chris Andersen, Desert Institute Volunteer