Northern CA Geology & Natural Science Hiking & Camping Group

And now for something completely different?
2-3 miles, minimal elevation gain.
Join us for a fascinating hike at Oyster Bay Regional Shoreline to explore the intersection of geomorphology and urban transformation. Once the site of the Oyster Bay Landfill, this area in San Leandro offers a premier example of "anthropogenic geomorphology"—where human activity has fundamentally altered the physical landscape. As we walk the trails, we’ll discuss how the original marshy shoreline was reshaped and elevated, creating an artificial landform that now interacts with the natural processes of the San Francisco Bay.
During our trek, we will examine the local terrain to see how the site has been graded and capped to manage drainage and erosion. We will also dive into the hidden world beneath our feet by discussing the two primary aquifers that lie below the East Bay: the shallow San Lorenzo Aquifer and the deeper, more expansive Niles Cone. We'll explore how the geomorphic history of the region—including the deposition of alluvial fans from the East Bay hills—created these vital water-bearing layers and how they are protected today from the bay's saltwater and historical land use.
The hike is a relatively easy loop with sweeping views of the water and the Oakland hills. It’s a great opportunity to connect with fellow enthusiasts to observe firsthand how land-use history, groundwater systems, and geological forces collide to create the modern Bay Area landscape. Please bring plenty of water, sturdy walking shoes, and a hat for the sun. We’ll meet at the Neptune Drive entrance before heading out to uncover the fascinating story of this shoreline park.
Exact route is still in the developing stage, but this AllTrails route is pretty close to what we'll do.

• Kids are welcome.
• Dogs are not welcome.
• Bring a lunch if you want to stay and visit with others at the picnic areas (near the end of the route).
• Donations accepted. I'll pass around my hat at the start of the hike and suggest $2/person.

There's no RSVP limit, but we averaging 15-25 folks. No-shows are not penalized, but please remember to change your RSVP if you change your plans.
Gather at 10:00 AM. I'll give an introductory talk with a bit of background on the region, if you've heard this before, just make sure you arrive by 10:15. If you get there late and can't find us, my cell number is five one oh, 495-7035 (please post advanced questions by email, not by phone).
Weather should be fine; heavy rain cancels, but we'll hike through light mist/drizzle.

When you are ready to register for the actual trip, final reservations and payments are made on evenbrite: https://June2026Lassen.eventbrite.com
PS. We usually finish in the 40 minute free Zoom window, but we can reconnect if we run over and get disconnected.

Registration payments are now open at https://June2026Lassen.eventbrite.com (ticketing through Meetup has much higher fees and doesn't have all the options of eventbrite). The only downside of eventbrite is it won't list the actual campsite, so ignore the map location on evenbrite...we are meeting at Lost Creek Group Campground.

Join us for three days of exploring the geology of Lassen Volcanic National Park. We’ve reserved a group site at Lost Creek Group Campground for June 26–30, which accommodates up to 20 people.
We’ll begin accepting RSVPs in late March or early April, but wanted to share the dates now so you can add them to your calendar.
The trip will include three full days of hiking on June 27–29, with plans for:

• A summit hike (about 5 miles with 2,000 feet of elevation gain)
• A hike through the park’s geothermal features
• One additional hike (details to come)

Most hikes will be moderate, though the summit hike is strenuous—it’s a steady climb most of the way up. Participants are welcome to skip any hike they’re not comfortable with, but campsite reservations will be prioritized for those planning to hike on at least two days.
If camping isn’t your preference, there are B&Bs and other lodging options available just outside the park’s north entrance. Those staying off-site are very welcome to join us for the hikes and unwind together around the campfire in the evenings.
We may also add an optional extension to explore Lava Beds National Monument, which would include one half-day and one full day of exploring. If offered, this extension will be listed as a separate trip.
More details about our trips can be found here.
Previous trips to Lassen include:

• July 2021 (Mt Lassen & Lava Beds listed separately--this year there was smoke from a bad fire and we ended up not going to Lava Beds)
• August 2013
• July 2011