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Mount Diablo “Trail Through Time” Geologic Hike (Sun. 10/18)

Sunday, October 18, 2020 @ 8:00 am - 2:00 pm


Hike Date: Sunday, October 18th 2020

Most of us have looked at Mt. Diablo and wished that we knew more about its origins and formations. Here’s your chance to spend a half-day with a 40-year professional geologist who has spent decades roaming the mountain and who’s adept at explaining geology in layman’s terms, while answering your questions.  Join RBG member and Save Mount Diablo docent and geologist, Martin Steinpress, for a hike up the mountain with stops at some of Mount Diablo’s amazing rock formations from near the Southgate entrance to the summit.

During the geologic field trip, you will visit several sites that illustrate plate tectonic and sedimentary settings. This very strenuous hike will begin near Rock City (elevation 1500 ft.) in the mid-Eocene (33 to 50-million-year-old) Domingene Formation marine fossiliferous sandstones.  Hikers will then traverse up the mountain (but down in time thru the geologic record) to the summit (3849 ft) in the Mesozoic Franciscan Complex (a mélange or complex mixture of subducted basalt, shale, chert and even more exotic rocks that are as old as 200 million years). On the way you’ll hike through the Cretaceous Great Valley Sequence and cross over the Diablo Thrust Fault.

If this sounds like Greek, come learn the language of geologists! With an elevation gain of over 2300 ft, this hike is only suited for the very fit.  The hike will complement rather than repeat the previous RBG 2018 and 2019 trips. So, sign up to expand your knowledge!

This trip assumes that COVID-19 social distancing will be necessary, so each party will drive their own cars and park and meet at Rock City. The hiking will be on trail, but strenuous. You will need hats, comfortable hiking shoes (hiking poles optional), face masks, appropriate clothes for the summit weather, and your own water and lunch. Due to social distancing, you will need to either hike back down to your car at Rock City or arrange your own shuttle.

Attendees will be contacted by the host, via phone or email closer to the event date to provide location information and other details.

NOTE: Subject to rescheduling due to weather, muddy conditions, high fire danger, conflicts, etc.


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Sunday, October 18, 2020
8:00 am - 2:00 pm
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The Ruth Bancroft Garden
(925) 944-9352
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