What we're about

Geo-hikes is open to hikers, geologists and geology students. Newsletter https://tdavisgeo.substack.com/
It's for anyone interested in learning a little geology while hiking and backpacking.

Visit Events\Calendar\Past on the Meetup page for the last few years for a quick appreciation, with photos, of Geo-hikes events, and the TDAVISGEO's Newsletter at substack.com. Some examples:

Crooked Creek, White Mtns: https://www.meetup.com/Geo-hikes/events/261057991/

Santa Cruz Island: https://www.meetup.com/Geo-hikes/events/260807872/

Deep Canyon and Santa Rosa Mtns: https://www.meetup.com/Geo-hikes/events/258848834/

https://tdavisgeo.substack.com/p/newsletter-8-geo-hike-guadalupe-with

Hikers, do you want to learn a bit of field geology and map reading skills while hiking, and sometimes camping in the western USA? Interested in participating in Geo-hikes and trips to scenic, and sometimes remote, locations? Want to learn about the fascinating history of the earth at these locations while on the move? If yes, then events hosted and led by the Geologic Maps Foundation might be of interest to you. Plus, the participants meet others with similar interests while getting great exercise. You do not have to be a geologist to attend but an eagerness to learn some basic geology and map reading skills are a must.

Professional geologists can share their knowledge and experiences (as co-leaders) with geology students and non-geologists while exercising and returning to, for many, why they got into geology in the first place.

Geology students (at any level) will gain field experience, an opportunity to interact and make contacts with professional geologists that could be helpful in the future, and with lots of outdoors exercise in interesting geologic settings.

There are a number of geo-hikes scheduled for the 2023 season and more will be added. "Spreading the word" about these events is most appreciated. Interaction of professional geologists and geology students with hikers, that are not geologists, informs the public about geology and its importance.

Most of the Geo-hikes events and courses are free while a few are fund-raisers and require a donation to cover expenses and operating costs for the longer trips. The Foundation is a tax-exempt nonprofit ,IRS 501 (3) (C), with a scientific educational and research focus. Donations are tax deductible and go towards the expenses of the event and the operating cost of the Foundation.

Geo-hikes also organize and lead customized geologic field trips for professional organizations and companies to various areas in the western US and Baja California. Trips are great educational and team building experiences. Please email us at: geologicmapsfoundation@gmail.com for more information about the customized trips.

For more info on the Geologic Maps Foundation: http://geologicmapsfo...

Upcoming events (4+)

Shelf Rd, Ojai, Geo-Hike

Valley View Preserve - Shelf Rd Trailhead (at Gridley Rd)

This is a 3.6 mile round trip hike along Shelf Road with minimal elevation gain and a moderate pace (~2.0 MPH). Hike starts at trail head parking area along Gridley Road and is "in-and-out" along the same dirt road. We'll hike out to the trail head at end of North Signal Street, turn around, and return to Gridley parking-there is no sweep and we do not wait for very slow hikers. Some of us may want to add on the Fox Canyon/Luci Trail Loop on the return part of hike and that adds about 1.5 miles and[masked] ft elevation gain.

The geology of Ojai Valley will be discussed along the way. Shelf Road is in uppermost portion of the Eocene-age Coldwater Formation* and in a few places along the contact with the overlying Oligocene-age Sespe Formation**, and their sandstone dominated outcrops will be observed and discussed. Shelf Road is within a map-scale structure called the Matilija overturn that is due to folding above the San Cayetano thrust fault*** that lies just below the earth's surface. The overturn is a band of rock layers where the stratigraphic order has been reversed and older strata lie above younger strata. This is due to large amounts of crustal convergence (shortening) during the last several million years.

Hike is along a well-hiked dirt road that's free of auto traffic. Be on the look out for rattlesnakes while hiking- watch where you step, and don't reach out or sit down without looking first. Snakes are commonly out in the evening, and if it's mild or warm, just about any time of year. We should be back to the cars by dark, but bring a head lamp or flashlight as a back-up, or if you intend to do the Fox Canyon/Luci Trail Loop with me.

*Coldwater Formation
https://en.wikipedia.org/wiki/Coldwater_Sandstone

**Sespe Formation
https://en.wikipedia.org/wiki/Sespe_Formation

***San Cayetano fault
https://en.wikipedia.org/wiki/San_Cayetano_Fault

DOGS ARE OK BUT PLEASE KEEP THEM ON A LEASH DURING HIKE

NO GUESTS, PLEASE HAVE THEM JOIN AND READ THE DISCLAIMER / RELEASE OF LIABILITY BELOW

DISCLAIMER / RELEASE OF LIABILITY*
(IMPORTANT, PLEASE READ BELOW IN ITS ENTIRETY):
The hike host is a volunteer and not responsible for the group. Safety should be a priority for everyone in the group. Please treat this meet-up as hiking with a group of friends. If you become fatigued and unable to continue the hike, it is expected you will advise the hike host of this and return to our starting point on your own. If you are able to proceed, it is expected that you will maintain line of sight with other members of the group at all times and help to promote the group’s safety and fitness goals.

Outdoor sports and other events we plan can be inherently dangerous and accidents may happen. By participating in any posted event, you are taking responsibility for your own safety and well-being. The Geo-hikes Meetup Group and its organizers are not trained leaders and we do not confirm the qualifications of any of its members to lead or participate in trips. All participants take full responsibility for their own actions.

If you choose to sign up for this or any Geo-hikes Meetup event, you are releasing the Geo-hikes Meetup Group and its organizers from all liability in case of possible injuries. Your personal safety depends on your own judgment and experience.

  • Anyone 18 yrs. or younger must be accompanied by a parent or legal guardian.

Lower Colorado River canoe trip

Walter's Camp

Geo-hikers,
We've been invited to make a canoe trip in the lower part of the Colorado River-Blythe to Yuma. Trip is led by Marc Grossman an experienced riverman and organized by Maria Swancoat. Canoes are supplied by Marc and the trip is estimated to cost about $250/person (more on the exact cost later). Cost include canoe use, camp fees, and all lunches and dinners while on the river. There will be 12 folks total on the trip that includes 7 Geo-hikers (including me but not Maria). Maria will be collecting the money before the trip (more on that later).

PLEASE READ ALL OF THIS CAREFULLY. IF INTERESTED GO ON THE WAIT LIST. REGULAR GEO-HIKERS WILL HAVE PRIORITY-NO GUESTS.

DO NOT GO ON THE WAIT LIST UNLESS YOU ARE ABSOLUTELY SURE YOU CAN MAKE THE TRIP AND CAN PAY FOR THE TRIP. IM STARTING TO KEEP TRACK OF THOSE THAT SIGN UP FOR TRIPS THAT REQUIRE PAYMENT AND ORGANIZATION ON MY END THEN CANCEL OUT RIGHT BEFORE THE TRIP; THIS IS HAPPENING TOO OFTEN.

Trip and meals:
Group meets late afternoon/evening Friday February 17 at Walter's Camp (below Blythe). Canoes in on Saturday morning, Canoes out on Tuesday, February 21 (about noon time). Maria may do one cooked breakfast. Group provides their own quick breakfasts and beverages. No personal coolers are allowed, no glass containers. Wine in boxes only. Wine drinkers share communally. Breakfasts/snacks need to be packed in critter proof containers, the racoons are a problem. Hot water is always available in the morning.

Carpooling is encouraged. We use shuttle drivers to take our cars down to the take-our marina. There is a per car cash fee ($40 in the past) that each car will pay in addition to the per person trip fee.

Here is the basic itinerary:
Friday - meet at Walter's Camp to overnight. Showers and flush toilets available.
Saturday - paddle down river, probable overnight camp in Carrizo boat-in site. Dry camp, vault toilets. Light hiking/exploring
Sunday - paddle to Picacho State Recreation Area main camp where we stay 2 nights. Hot showers and water available, vault toilets.
Monday - group day hike or R&R
Tuesday - paddle to Fisher's Landing, Martinez Lake (near Yuma). Take out about noon. Drive home.
Distance on the river is 38 miles. Easy paddle, all flatwater.

We will be doing short hikes in the adjacent desert and discussing the geology and natural history.

Geologic maps along river trip:
Geologic map of California : Salton Sea sheet
https://ngmdb.usgs.gov/Prodesc/proddesc_333.htm

Geologic map of California : San Diego-El Centro sheet
https://ngmdb.usgs.gov/Prodesc/proddesc_489.htm

Thom Davis
https://tdavisgeo.substack.com/
geologicmapsfoundation.org

DISCLAIMER / RELEASE OF LIABILITY*
(IMPORTANT, PLEASE READ BELOW IN ITS ENTIRETY):
The hike host is a volunteer and not responsible for the group. Safety should be a priority for everyone in the group. Please treat this meet-up as hiking with a group of friends. If you become fatigued and unable to continue the hike, it is expected you will advise the hike host of this and return to our starting point on your own. If you are able to proceed, it is expected that you will maintain line of sight with other members of the group at all times and help to promote the group’s safety and fitness goals.
Outdoor sports and other events we plan can be inherently dangerous and accidents may happen. By participating in any posted event, you are taking responsibility for your own safety and well-being. The Geo-hikes Meetup Group and its organizers are not trained leaders and we do not confirm the qualifications of any of its members to lead or participate in trips. All participants take full responsibility for their own actions.
If you choose to sign up for this or any Geo-hikes Meetup event, you are releasing the Geo-hikes Meetup Group and its organizers from all liability in case of possible injuries. Your personal safety depends on your own judgment and experience.

  • Anyone 18 yrs. or younger must be accompanied by a parent or legal guardian.

2
Lower Colorado River canoe trip

Walter's Camp

This is the 2d trip lower Colorado River trip, don't confuse with a similar trip in February 2023.

Geo-hikers
We've been invited to make a canoe trip in the lower part of the Colorado River-Blythe to Yuma. Trip is led by Marc Grossman an experienced riverman and organized by Maria Swancoat. Canoes are supplied by Marc and the trip is estimated to cost about $250/person (more on the exact cost later). Cost include canoe use, camp fees, and all lunches and dinners while on the river. There will be 12 folks total on the trip that includes 8 Geo-hikers (including me but not Maria). Maria will be collecting the money before the trip (more on that later).

PLEASE READ ALL OF THIS CAREFULLY. IF INTERESTED GO ON THE WAIT LIST. REGULAR GEO-HIKERS WILL HAVE PRIORITY-NO GUESTS.

DO NOT GO ON THE WAIT LIST UNLESS YOU ARE ABSOLUTELY SURE YOU CAN MAKE THE TRIP AND CAN PAY FOR THE TRIP. IM STARTING TO KEEP TRACK OF THOSE THAT SIGN UP FOR TRIPS THAT REQUIRE PAYMENT AND ORGANIZATION ON MY END THEN CANCEL OUT RIGHT BEFORE THE TRIP; THIS IS HAPPENING TOO OFTEN.

Trip and meals:
Group meets late afternoon/evening Friday March 24th at Walter's Camp (below Blythe). Canoes in on Saturday morning, Canoes out on Tuesday, March 28th (about noon time). Maria may do one cooked breakfast. Group provides their own quick breakfasts and beverages. No personal coolers are allowed, no glass containers. Wine in boxes only. Wine drinkers share communally. Breakfasts/snacks need to be packed in critter proof containers, the racoons are a problem. Hot water is always available in the morning.

Carpooling is encouraged. We use shuttle drivers to take our cars down to the take-our marina. There is a per car cash fee ($40 in the past) that each car will pay in addition to the per person trip fee.

Here is the basic itinerary:
Friday - meet at Walter's Camp to overnight. Showers and flush toilets available.
Saturday - paddle down river, probable overnight camp in Carrizo boat-in site. Dry camp, vault toilets. Light hiking/exploring
Sunday - paddle to Picacho State Recreation Area main camp where we stay 2 nights. Hot showers and water available, vault toilets.
Monday - group day hike or R&R
Tuesday - paddle to Fisher's Landing, Martinez Lake (near Yuma). Take out about noon. Drive home.
Distance on the river is 38 miles. Easy paddle, all flatwater.

We will be doing short hikes in the adjacent desert and discussing the geology and natural history.

Geologic maps along river trip:
Geologic map of California : Salton Sea sheet
https://ngmdb.usgs.gov/Prodesc/proddesc_333.htm

Geologic map of California : San Diego-El Centro sheet
https://ngmdb.usgs.gov/Prodesc/proddesc_489.htm

Thom Davis
https://tdavisgeo.substack.com/
geologicmapsfoundation.org

DISCLAIMER / RELEASE OF LIABILITY*
(IMPORTANT, PLEASE READ BELOW IN ITS ENTIRETY):
The hike host is a volunteer and not responsible for the group. Safety should be a priority for everyone in the group. Please treat this meet-up as hiking with a group of friends. If you become fatigued and unable to continue the hike, it is expected you will advise the hike host of this and return to our starting point on your own. If you are able to proceed, it is expected that you will maintain line of sight with other members of the group at all times and help to promote the group’s safety and fitness goals.
Outdoor sports and other events we plan can be inherently dangerous and accidents may happen. By participating in any posted event, you are taking responsibility for your own safety and well-being. The Geo-hikes Meetup Group and its organizers are not trained leaders and we do not confirm the qualifications of any of its members to lead or participate in trips. All participants take full responsibility for their own actions.
If you choose to sign up for this or any Geo-hikes Meetup event, you are releasing the Geo-hikes Meetup Group and its organizers from all liability in case of possible injuries. Your personal safety depends on your own judgment and experience.

  • Anyone 18 yrs. or younger must be accompanied by a parent or legal guardian.

5
Santa Cruz Island Geo-hikes 4 days & 3 nights stay at the SCI Field Station

Island Packer Cruises

$395.00

TRIP IS FULL AS OF 12/20/2022.

YOU MUST BE FULLY COVID-19 VACCINATED. UC REQUIREMENT.

READ THIS CAREFULLY. ANSWER THE QUESTIONS OR YOU WILL BE REMOVED FROM THE WAITLIST. MEMBERS THAT HIKE WITH GEO-HIKES FREQUENTLY WILL HAVE PRIORITY ON TRIPS. WE ARE STARTING TO KEEP TRACK OF THOSE THAT SIGN UP FOR TRIPS THAT REQUIRE PAYMENT AND ORGANIZATION ON OUR END THEN CANCEL-OUT RIGHT BEFORE THE TRIP.

IF YOU ARE ADDED TO THE TRIP (FROM THE WAITLIST TO THE ATTENDEE LIST) WE WILL NEED AN EMAIL ADDRESS AND FULL NAME SENT TO [masked] ASAP. YOU'LL NEED TO PROVIDE YOUR FULL NAME, THE NAME OF THE TRIP YOU ARE GOING ON, AND YOUR EMAIL ADDRESS (DON'T ASSUME I HAVE OR KNOW YOUR EMAIL ADDRESS). FURTHER INFORMATION ON THE TRIP: BOAT RESERVATIONS, WHAT TO BRING, ETC. ARE SENT TO YOU BY EMAIL.

This is a unique experience to learn about the natural sciences of the Northern Channel Islands and to make short hikes to beautiful beaches and geologically interesting locations on Santa Cruz Island (SCI) that are closed to the general public. There are only six spots available for this trip. All of the beach hikes are along pristine and lovely coastlines that provide a glimpse of what southern California beaches looked like hundreds of years ago. The geology, history (including the prehistoric record), and flora and fauna of the island will be discussed. Thom Davis, the trip leader, is lead author on The Geological Society of America's 2020 Field Guide (#59) to Santa Cruz Island and the contents of the guidebook will be used extensively during the trip:
https://pubs.geoscienceworld.org/books/book/2279/chapter/126263829/Santa-Cruz-Island-field-trip-Geology-history-and

Trip is designed for non-geologists and key earth science concepts will be explained in a manner for all to understand. Geologists are welcome too. The cost is $395/person and covers the cost of our stay at Christy Ranch, vehicle rental, and vehicle fuel. Payment will be by check to the Geologic Maps Foundation and payment instructions will be provided later by email. See cancellation policy. Cost does not include the Island Packer's boat trip fare to the island and return that are $84.00/adult-roundtrip or $79.00/senior-roundtrip.

We will be staying at the historic Christy Ranch on the western end of the island that has bathrooms with showers, a well-equipped kitchen with stove, oven, and refrigerators, dining room, and wifi. We cannot sleep inside Christy Ranch as the building are not seismically retrofitted. You will need to bring a sleeping bag (nightly lows are usually above 40 degrees F), a tent, sleeping pad, and a backpacking-size ground tarp. You are responsible for bringing all your meals and drinks (potable water is available at the Ranch), preparing your meals, and clean-up. More information on what to bring will be provided later.

No stores are on SCI and cell coverage is not available on much of the island but it is at Christy Ranch and the Main Station.

This is a fund raiser for the nonprofit Geologic Maps Foundation (GMF), www.geologicmapsfoundation.org. GMF is a 501 (c) (3) organization and donations are tax deductible.

Itinerary: First day, land at Prisoners Harbor at about 11:00AM, pick-up vehicles, orientation, driving tour of the Canada del Puerto to the UC SCI Main Field Station, check-in, lunch, followed by a drive to Christy Ranch along the Southern Ridge Road. On the drive we will stopping for landscape panoramas, discussions of the geology, rock types, and flora and fauna. For example, at one point there is a very good view of gully offsets along active SCI fault that bisects the island, https://youtu.be/n5jfomHlgyA. At Christy Ranch we will set up our camp, possibly take a short beach hike, and prepare our dinners. Second Day, we will drive to Poso Canyon make a hike to scenic Near Point and possibly over to the beach at Johnson's Lee (lunch is at the beach). If time allows, we will hike down to Sauces Beach and Kinton Point. Third day, we will make two short hikes: 1) outcrops south of Christi Beach, and 2) a sea-cliff exposure of the SCI fault. We will then drive out to Frazer Point to do more beach hiking, view the rich-assortment of bird life around the point, and discuss the marine terraces and sea-level changes during the late Quaternary. Fourth day, we will pack up, tidy up the Ranch portions we used and head back to the Main Research Station and Prisoner's Harbor via the Central Valley Road. Half-way back we will make a detour to hike to the top of Diablo Peak (elev=2450 ft) that provides a great panorama of the Northern Channel Islands, Santa Barbara Channel, and the Santa Barbara-Ventura coastline and mountains. The top of Diablo is also a great place to see and discuss the Santa Cruz Island Volcanic Complex that underlie most of the northern portion of SCI. We return to Prisoners Harbor, if time allows do a hike to Pelican Bay or towards the Isthmus, and catch the boat for the return to Ventura at 4:30PM.

Past events (297)

Ventura hillside Geo-hike

Hillcrest Drive

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