What can the rocks beneath our feet tell us about the history of Sonoma Mountain?
Join geologist Nicole Myers for Rocktober at Jack London State Historic Park and explore the fascinating geologic forces that have shaped Sonoma Mountain. As part of the Triple Watershed Series presented by Sonoma State University’s Center for Environmental Inquiry, this program will focus on the Sonoma Creek watershed and reveal how rocks, water, and life are all connected.
The program will begin at the museum, followed by a walk to the Wolf House Ruins. Along the way, Nicole will explore the geologic history of Sonoma County, the forces of the San Andreas Fault System, and the role of water in shaping the landscape. Participants will also discover the story behind Sonoma Volcanics.
After returning from the Wolf House Ruins, participants will have the option to take a short snack break before continuing their exploration of the park’s geology. Those who choose to extend the adventure will continue on a hike toward Quarry Trail, where Nicole will take a closer look at the rocks and geologic processes that help tell the story of Sonoma Mountain.
Whether you’re fascinated by geology or simply want to see the park from a different perspective, Rocktober offers a unique opportunity to connect with the land.
Please note: Participants may choose to end the program after the walk to the Wolf House Ruins (approximately 1.2 miles roundtrip) or continue on the optional Quarry Trail portion, which includes an additional approximately 3 miles roundtrip. The full program includes walking on uneven terrain and elevation gain. Please bring water, comfortable hiking shoes, sun protection, and a snack.
Presenter
Nicole Myers, M.S. in Geological Sciences, developed a passion for understanding the Earth from a childhood fascination with rocks and volcanoes, and now teaches others to appreciate planet Earth. Nicole has been teaching earth science classes, including geology, climatology, & Earth history for more than 20 years. She currently teaches Geology and Earth Sciences at Sonoma State University (SSU) through the Applied Human and Environmental Sciences DEpartment and Osher LIfelong Learning Institute (OLLI) and through Appreciating Earth, and is the SSU Center for Environmental Inquiry (CEI) Program & Outreach Specialist. Nicole brings her enthusiasm to the community by offering Earth science field explorations and presentations.
Learn more about the series!
The Triple Watershed Series
Join geologist Nicole Myers, CEI’s Program and Outreach Specialist, to explore the geologic history of the three watersheds of Sonoma Mountain. Learn how the formation of the San Andreas Fault System lifted the rocks of Sonoma Mountain out of the depths of the ocean, then caused millions of years of volcanic eruptions. Explore the oceanic and volcanic rocks of the mountain that record 180 million years of Earth history, the faults that have formed beautiful landscapes over the last 20 million years, and the streams that have been carved into the mountain as water flows to the Pacific Ocean by way of the Russian River and San Pablo Bay.
WHEN: Saturday, October 17, 2026 (11:00 am – 3:00 pm)
WHERE: Jack London State Historic Park *Make a left after the entrance kiosk to park in the museum lot
ADMISSION: $15
The park entrance fee is waived for this event.
Price: $15.00