Video by Bob Kroll

Welcome to Williams GeoAdventures! We pride ourself in custom-designing GeoAdventures for folks who love geology, but we do so much more. We partner with top-notch expert local travel partners, and each trip combines not only fabulous geology and the beauty of the natural world, but offers experiences in each regions historic, cultural, and gastronomic delights. And we always have a lot of fun!

These trips are made for the geology enthusiast. We pick an existing trip or develop a new one and propose a time frame for offering that trip such as "Winter 2020". People contact us to be placed on the Interested Parties list for that trip. People on the list have the first opportunity to sign up. When enough people are interested, we finalize the trip dates and costs and announce the trip to the interested parties list, and collect your deposits. We then announce the trip to the general public to fill any remaining spaces. No previous geologic course work is required.

International trips


Dolo-Slovo Geology Field TripScotland Orkney/Shetland Island Rocks!
June 3–15, 2019 | $5,380 Just two spaces left!

Welcome to the Williams GeoAdventures Scotland Orkney/Shetland Rocks! 2019 Trip. The Northern Isles of Scotland are wild and beautiful archipelagos with unique prehistoric cultural landscapes that allow us to understand life in these remote regions stretching back some 6,000 years. These are islands where there is a strong connection between the geology, landscapes and people and you get a sense for how people lived in the past, deeply connected to the land and the climate. Although at first sight the two island groups are very different, there is a common thread both in geology and culture that runs through this area from the north of Scotland to Scandinavia.

The Neolithic ancestry of Orkney is evident in the many ancient monuments, stone circles and tombs that are testament to its UNESCO World Heritage Site status. The rapid spread of Neolithic culture up the western seaways brought early Megalithic culture and farming settlements such as the village at Skara Brae. There are numerous chambered cairns, including the magnificent Maeshowe passage grave, and the standing stones at the Ring of Brodgar. The geology of the Orkney Islands is dominated by Devonian-age Old Red Sandstone, containing fossil fish and eroding to spectacular coastal scenery.

The same rocks are found in the south of the Shetland islands, but overall the geology of Shetland in more varied: dominated by a wide range of different metamorphic rocks, linked to the Lewisian, Dalradian and Moine of the Scottish Highlands, but compressed and juxtaposed in narrow slices and accompanied by granite, sandstone and volcanic rocks from the Devonian period. In Unst in the far north, we'll find a unique assemblage from the Iapetus Ocean floor.

Overall, the wide variety of rocks that is reflected in the different character of every Shetland island and every view. These rocks and scenery would be enough to entertain and delight on their own, but are accompanied by many other features of interest, including rich archaeology and culture, and world-famous bird life.

Our amazing travel partner for this trip is Angus Miller.  Angus has offered geologic tours of Scotland through his business, Geowalks ( for over 20 years.

Itinerary for Scotland Orkney/Shetland Island Trip  |  Contact Tom for more information


Dolo-Slovo Geology Field TripDolo-Slovo Rocks!
Exclusive for NWGS and Friends!
June 27-July 7, 2019 | $3,950 Full with 24. Wait List

The Dolo-Slovo Rocks! Trip visits three of the most amazing regions of North-eastern Italy and Slovenia: The Julian Alps and the Postojna Caves of Slovenia, the Trieste/Carso (Karst) area, and the enchanting Dolomite Mountains.

Julian Alps - The Julian Alps are renowned for their scenic beauty, Slovenian culture, and gastronomic specialties.  We will also visit the World Heritage Site at the unforgettable Postojna Caves in Slovenia.

Trieste and Carso area - Trieste has the beauty of the azure Adriatic Sea.  In this corner of Italy is the classical beauty of the Mediterranean landscape, tempered by the first hints of the Slavonic worlds, as well as the Alps, which provide an almost magical backdrop to the area.  The long-standing Austrian-Hungarian presence can still be felt in the air here, and has left many traces in the landscape, in the cuisine, and in the local customs. It is a region known far and wide for its geological features – so important that they even gave their name to a whole series of geological phenomena (defined precisely as 'karstic').

Dolomite Mountains – The Dolomites capture the imagination for their stunning peaks seemingly coming out of the dark green of spruce forests.  The name 'Dolomites', almost speaks for itself as a synonym for "magical mountains", with remarkable geology, charming towns, and delectable fresh local food and wine. The Dolomite Mountains are a UNESCO World Heritage Site.  We will experience many of the serial properties of the Dolomite World Heritage Site during our stay, including Tre Cime and Bletterbach gorge. 

The trip will include a series of highlights from all three regions. The majestic peaks of the Dolomites – with the immense views they offer, and the incredible experience of walking on what was once the bed of an ocean, will be complemented by the monumental caves we will see in the Carso and Slovenia. We will walk on historical trails, taking in the grandeur of nature as well as the cultural, artistic, historical and gastronomical plenty that these regions offer.   We are talking some memorable meals, folks – and did we mention the wines?

Our outstanding local travel partner on this trip is Maximiliano Calligola (Max).  Max is a botanist and naturalist and a registered Italian nature guide.  Check out his website at

Itinerary for the 2019 Dolo-Slovo Rocks! Trip  |  Details on the Dolo-Slovo Rocks! 2019 Trip
Contact Tom for more information


AWG New Zealand Geology Field TripAssociation for Women Geoscientists New Zealand Rocks!
North & South Islands of New Zealand

February 26–March 12, 2020 | $5,180
Full with 22. Wait list closed.


Scotland Geology TripScotland Rocks! Geology Field Trip
June 2020

Photos from previous Scotland trips

Travel through Northern and Central 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, whiskey-tasting, castles and more!  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 more information

Western U.S. trips 


Grand Canyon Geology TripGrand Canyon Raft & Rock

Upper Grand Canyon: April 20-25, 2020  | $3,290
Full with 21. Wait list.

Photos from 2018 Grand Canyon trip by Russ Powell

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! All of this at the most beautiful time of year in the canyon.

This trip 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.

Details on the 2020 Grand Canyon Raft and Rock 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

California North Coast Geology Field Trip October 2018

Yosemite-Eastern Sierra September 2018

Grand Canyon Raft & Rock July 2018

Dolo-Slovo Rocks! June/July 2018

Scotland Rocks! II – The Islands of the West June 2018

New Zealand Rocks! December 2017

Geology of Lassen Volcanic National Park September 2017

Grand Canyon Raft and Rock August 2017

Scotland Rocks! June 2017

Geology of Death Valley National Park March 2017

California North Coast Geology Field Trip September 2016

Grand Canyon Raft and Rock August 2016

Iceland Rocks! GeoAdventure July/August 2016

Scotland Rocks! II – The Islands of the West June 2016

Yosemite-Eastern Sierra Geology Field Trip September 2015

Scotland Rocks! Geology Field Trip June 2015

Italy Rocks! GeoAdventure June 2014

California North Coast Geology Field Trip March and September 2014

Eastern Sierra Geology Field Trip October 2013

Yosemite/Eastern Sierra Geology Field Trip October 2012

Scotland Rocks! Geology Field Trip July 2012

Geology of Grand Canyon National Park June 2011

Geology of Death Valley National Park April 2011