Please review our hiker info page to familiarize yourself with hiker safety rules and our hike ratings so that you can select hikes that meet your level of fitness. Unless specified otherwise in the activity descriptions below, hikes have a 15 person limit, and they begin in the ABDNHA parking lot.

geology

Events for January 24, 2026

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Field Trip: Ancient Lake Cahuilla – FULL (waitlist)

ABDNHA Parking Lot 652 Palm Canyon Drive, Borrego Springs

Special Earth Science Series
FIELD TRIP IS FULL - PLEASE CALL ABDNHA at 760-767-3098 to get on waitlist.
Leader: John Peterson, Hydrologist and Geologist

Approximately 12,000 years ago, the Colorado River altered its course, forming a massive prehistoric lake known as Lake Cahuilla, which is now the Salton Sea.   The lake served as a vital resource for the Cahuilla, Kumeyaay, and Cocopah peoples. Over the centuries, the lake filled and dried up many times. It last filled between 1731 and 1733. Hydrologist John Peterson will lead a half-day field trip to the Salton Sea, where participants can explore the ancient lake's remnants, including visible "bathtub rings" and fishing traps. Meet at ABDNHA. General Public: $18, Members: $12, Volunteers: $10. Register online or at the Nature Center, 760-767-3098.

$10.00 – $18.00

Peninsular Ranges

Lecture: Geology of San Diego County’s Peninsular Ranges

ABDNHA Library 652 Palm Canyon Drive, Borrego Springs

Special Earth Science Series

Speaker: Geologist Don Barrie

Please join Mesa College geology professor and ABDNHA board member, Don Barrie, for this lecture on San Diego County’s Peninsular Ranges, with emphasis on the Laguna Mountains west of Borrego Springs. Don’s lecture will focus on how plate tectonic processes have created the complex collage of igneous and metamorphic rocks exposed both regionally, throughout southeastern California, and locally, in the Lagunas. In the ABDNHA Library. General Public: $12, Members: $10, Volunteers: $8. A related field trip is scheduled for Sun., Jan. 25.

$8.00 – $12.00
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