Geology of Sonoma County

November 14, 2021 from 10:00 11:30 AM

Gualala Point Regional Park

42401 Coast Highway 1
Gualala, CA 95445
38.75912194, -123.5231194

Step back in time as we explore how plate tectonics and volcanic activity have shaped our local landscapes. Learn why Sonoma County is home to such rich geologic diversity and how that diversity has informed the history of the region. Parking $7 or free for Regional Parks members. For more information, contact Ellie Muelrath by email at

October 10 - Helen Putnam Regional Park
From Sea to Land: Creation of the Petaluma Valley –
Take in sweeping views of the Petaluma Valley while learning about the forces that sculpted the rolling hills of Sonoma County. Step back in time and imagine what life was like when California was covered by a warm shallow sea. Prepare for a 2-mile hike on an accessible trail with moderate inclines.

    November 14 - Gualala Point Regional Park/Bluff Top Coastal Access Trail, meet at the visitors center
    Interpreting Rock Formations: Plate Tectonics and the Gualala coastline –
    Explore the boundary of the North American and pacific plates while marveling at unique geological sites along the Sonoma Coast. View sandstone formations chiseled by the elements and 90 million-year-old rocks that were once connected to the Monterey coastline. Dress in layers and expect a level 2-mile walk along the bluffs of Sonoma County’s northern most park. 

    December 12 - Riverfront Regional Park
    A River’s Journey: Geology of Riverfront Park – Learn about the history of Riverfront Park and how geology and water combine to impact the landscape around us. We will cover the unique geology of the river, the history of land use in the area, and human modifications that have changed the river’s historic path. Prepare for a 2-mile hike on an accessible trail with stops to appreciate the geologic features found within the park.

    Visit Gualala Point Regional Park

    Gualala Point Regional Park bench and view

    Next to the Gualala River, this 195-acre park has open meadows mixed with coastal forest. Campground, trail system, coastal vistas and sandy beaches.