Here's how each GeoAdventure happens. I pick a time period for proposed upcoming trips such as "Summer 2015". People contact me to be placed on the "interested parties list" for that trip. When enough people are interested, I contact the group to finalize the trip and date. Once the date is set, I announce the trip and others can register. No previous geologic course work is required.
Bay Nature video

Bay Nature Magazine Salt Point Geology Hike

International trips


Italy Geology field tripItaly Rocks! GeoAdventure
June 1–15, 2014 - $4,815 Full

Join a fabulous 15-day tour of Northern and Southern Italy, exploring up-close the volcanoes and splendid landscapes and geology, in this once in a lifetime experience of Italy’s geologic wonders. This tour is packed with amazing hiking adventures, expert guides, wonderful accommodations and food, leisure time, fun – and visit six UNESCO World Heritage Sites! Join me in a custom travel experience crafted for the geology enthusiast who also enjoys the richness of Italy. The warm weather is lovely with no big crowds. The hikes are easy to moderate, guaranteed to be interesting, and really fun!

Here is your chance to experience Sicily, the Aeolian Islands, Naples, and Pompeii in the 8-day Southern Italy leg. See some of the most spectacular sites nature has to offer, visiting four active volcanoes and witnessing first-hand an active eruption. The southern leg has dazzling coastal scenery, rich history, and superb photography. Erupting volcanoes and fumaroles! Pizza and wine! Archaeology meets geology!

In the 7-day Northern Italy leg, we explore the stunning Cinque Terre (3 days) and the majestic and remarkable Dolomite Mountains (4 days). Cinque Terre is five beyond quaint multicolored seaside villages perched high atop the breathtaking Mediterranean coastline, which we explore by walking the astonishing coastal path. The rocks of the Dolomites glow with golden, pink, and purple hues at dawn and dusk. Sleep and eat in hand-picked unique spots. Hike scenic trails in Cinque Terre and the Dolomites that will knock your socks off. Incredible geology and plants! Majestic views! A fascinating scientific, cultural, and historical mix!

Photos of the Italy Rocks! Geology Field Trip
Click here for details on Italy Rocks! 2014
Click here for an itinerary of Italy Rocks! 2014
Click here for an application for Italy Rocks! 2014


Scotland Geology TripScotland Rocks! Geology Field Trip
June 2-13, 2015

Click here to view photos from the Scotland trip

Travel through Northern Scotland studying fundamental geological concepts and exploring the landscapes and geology of the Scottish Highlands in this unique 12-day field trip.  Scotland boasts spectacular scenery and the most varied geological landscapes of any country of its size in the world.  Edinburgh, the capital of Scotland, is one of the most beautiful cities in Europe and has two volcanoes to boot!  The trip includes multiple night stays in Edinburgh, Inverness, Ullapool, and the Isle of Skye.

Day trips will study fundamental concepts that were important in the development of geology as a science.  Participants gain first-hand experience in relative dating principles and interpreting geologic history.  Four days will be spent exploring the area around Edinburgh and will include Edinburgh’s volcanoes, the area around Dunbar, St. Andrews, and Siccar Point, the location of Hutton’s Unconformity.  The next eight days will explore the Scottish Highlands, including a three-night stay on the enchanting Isle of Skye.  Trips to the north and northwest will study geological processes, structural geology, and landscape development, expanding on the tools learned in Edinburgh. Contact Tom for details on the Scotland Rocks! Geology Field Trip

U.S. trips


CA North Coast Geology TripCalifornia North Coast Geology Field Trip
March 28–30, 2014 - $400 Full
September 19-21, 2014 - $400 - New Trip. Registration Open.

Click here to view photos from previous North Coast trips

Explore the remarkable geology along the coast north of San Francisco from Bodega Head to Mendocino in this three-day field trip. Wave-cut platforms, rocky headlands and sea stacks, uplifted terraces, crashing waves, and wide sandy beaches are your outdoor classroom as you discover how the collision of ocean and land has shaped the shore. You explore rocks formed millions of years ago when the ancestral Pacific plate collided with the North American plate, leaving the remarkable and world-famous sequence of marine sedimentary and volcanic rocks called the Franciscan complex. You also investigate the impact of tectonic movements along the San Andreas Fault that are lifting the land and slowly sliding rocks to the west of the fault zone toward Alaska.

The itinerary includes Bodega Head, Mammoth Rock, and Fort Ross on the Sonoma Coast, and Anchor Bay, Bowling Ball Beach, Point Arena, and the Big River on the Mendocino Coast, as well as shorter stops along the way. Participants stay at one or two Irish Beach homes with stunning ocean views of Point Arena. There are numerous short hikes of up to two miles.

Click here for details on the California North Coast Geology Field Trip

Private Half-Day or Full-Day Geology Field Trips
Along the Marin and Sonoma Coast from the Marin Headlands and Point Reyes to Salt Point State Park I would love to design a short trip for your family or group. Price negotiable based on group size.
Contact Tom for details

Past trips


Yosemite/Eastern Sierra Geology Field TripYosemite/Eastern Sierra Geology Field Trip
October 2013

The Yosemite and Eastern Sierra trip is a 5-day exploration of the Yosemite Valley and the Eastern Sierra from Bridgeport to Bishop, including Devil’s Postpile, Bodie, Mono Lake, and the Long Valley Caldera.  The beauty and spectacular geology and landscapes of the Yosemite Valley are awe inspiring.  The Mammoth area is the most active volcanic area in the continental U.S. in the last million years and has some impressive glacial features.  We will even have the chance to soak in several hot springs!  Camping and lodging options are planned in both the Yosemite Valley and Mammoth area.
Photos of the Yosemite/Eastern Sierra Geology Field Trip
Photos of the Yosemite/Eastern Sierra Geology Field Trip by Anne Leonard


Grand Canyon Geology TripGeology of Grand Canyon National Park
June 2011

Click here to view photos from previous Grand Canyon trips

Imagine yourself on a raft on the Colorado River entering into Grand Canyon National Park. This could be you! What better way to raft and explore the Grand Canyon than with a geologist!

The course includes a 6-day oar-powered rafting trip on the Colorado River into Grand Canyon National Park from Lees Ferry to Phantom Ranch. There is also a travel day before and after the trip.

Join me on an exciting journey back through geologic time. The rafting trip travels through progressively older rocks that span the entire Paleozoic Era as Marble Canyon deepens, before reaching the 1.8 billion year-old rocks of the Inner Gorge of the Grand Canyon. This is one-third of the age of the Earth! The geology trip reading assignments are on John Wesley Powell and his explorations of the Grand Canyon and the geologic history of the Grand Canyon and Colorado Plateau. The field trip focuses on geologic processes at work in the canyon, such as weathering, erosion, and mass wasting; depositional environments and sedimentary structures; geologic time and dating; faulting and folding; and igneous and metamorphic rocks. The trip includes a strenuous hike out of the Grand Canyon from Phantom Ranch to the South Rim and numerous daily side canyon hikes.


Death Valley Geology TripGeology of Death Valley National Park
April 2011

Click here to view photos of previous Death Valley trips

Come experience the geological playground that is Death Valley National Park in this unique week-long field trip. Travel through geologic time and view the limestones and volcanic rocks of Titus Canyon. Explore a ghost town at Rhyolite. Hike through the colorful sediments of Golden Canyon. Ponder the mystery of Racetrack Playa. Hunt for fossils at a Paleozoic limestone reef.

This is a 6-day geology field trip that begins and ends in Bishop, California. We all meet in Bishop on Saturday evening and return the following Friday evening. We stay at a Bishop motel those two nights. We enter into Death Valley from the north on Sunday through Wesgard Pass and return from the south on Friday through the Panamint Valley. We stay in Death Valley for five nights (Sunday through Thursday) at Furnace Creek.

Camping at Furnace Creek Campground with optional accommodations at Furnace Creek Ranch or Inn.