Designated a National Natural Landmark in 1973, Amboy Crater was recognized for its visual and geological significance. There are a number of dormant volcanoes in the Mojave Desert, and Amboy crater is a perfect example of a cinder volcanic cone very similar to the volcanoes throughout the region. Amboy crater is a youthful cone geologically, having erupted as recent as 10,000 years ago (although most geologists agree the volcano is probably 100,000 years old). Cinder cones are small basaltic volcanoes that spit spongy fragments of basaltic lava up to an inch or two in diameter. This spongy material is called tephra. As the tephra lands after being spit into the air, it breaks into small pieces and cools. Normally, there are a lot of gas bubbles in the basalt as it cools, causing a lot of air pockets inside the rock. This makes the rock somewhat lightweight. Join Professor Tor Lacy on this all-day field trip.

Download the course outline: Geology of Amboy Crater

Hike Level: Moderate (Fitness Levels)

If you are a member of JTNPA/PINE you will get a $10 discount off every Desert Institute class. If you are not a member you can become one here.

Before registering, please take the time to review our General Class Information and download the Enrollment Attachments, that contain pertinent information about your class, the Joshua Tree National Park and camping reservations.

BLM Photo: Bob Wick

Geology of the Amboy Crater Spring 2018

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