Part 2 of the geologic story of the San Jacinto Mountains. Join Park Interpreter Ali Barnes to investigate how these strikingly vertical peaks are being torn down by earth’s erosional forces, even as they continue to rise into the sky. Just as the volcanos that preceded them 100 million years ago are now gone, the uplift will end sometime in the distant future and time and gravity will, together, inexorably prevail and these mountains too will slowly disappear from the landscape forever.  She will begin with an hour-long lecture and then proceed with a 1.5-mile walk around Long Valley to apply that newly gained knowledge to our immediate surroundings.

Date: September 8, 2018
Time: 9:00 a.m. to about 12:00 p.m.  First trams departs at 8 a.m. Arrive early.
Place: Tram mountain station, Nichols Room on the ground floor to the left of the patio at the top of the ramp to the valley.
Difficulty Level: easy to moderate
Distance:  1.5 miles round trip
Destination: Long Valley
Preparation:  It will be about 30 degrees cooler than the desert floor, dress accordingly. Bring water and consider snacks

Any questions please contact us at

Present your NHA membership card and receive a 20% ticket discount on tram fare and 10% on food.


Booking:  A reservation is required.  Only one booking is permitted at a time. For more than one, simply fill out the form again with the information for each additional enrollee and submit. Overbookings will be waitlisted and if space becomes available enrollee will be notified in order of priority.

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