Our Mission is to distribute information related to earth science in and around Jackson and Teton County, Wyoming, and to provide educational opportunities on geoscience and related issues to members and the public.

News and Events

Would you like a Geology Program For Your Club or School?  Speaker or Film

Recent Presentations

Geologists of Jackson Hole

April and May 2014 public programs

In conjunction with Teton Co. Library

All free & open to the Public at 6 p.m.


 April 15 (Tuesday), 6:00 p.m., Teton Co. Library Auditorium - Open to Public. Presentation: " The Precambrian Geology of the Teton Range: A window into the Tectonic Development of the Earth’s Crust”.  by Ron Frost, University of Wyoming.

Take a tour with Ron Frost of the ancient rocks that make up one of the youngest mountain ranges in North America, and learn how data show these rocks to have been formed in part in primeval oceans, and incorporated into mountain building events early in Wyoming’s, and indeed earth’s history.

The Precambrian gneisses of the Teton Range consist of two distinct domains, a northern domain, which we call the Moose Basin Domain, and a southern domain we call the Rendezvous domain.  The boundary between these two domains lies approximately at Leigh Canyon.  The Moose Basin domain is characterized by remnant metamorphism that reached at least 10 kilobars and 950°C. Partial melts from mafic granulites that formed during this event contain zircon that gives a U-Pb age of 2.70 billion years (Ga.), making these the oldest Hi-Temp – Hi-Pressure rocks in the world.  These rocks are in tectonic contact with rocks that are petrologically similar to modern ocean-floor rocks, including metaperidotites, amphibolitic metagabbros, and paragneisses, which are probably meta-greywackes. The tectonic assembly of the high-Pressure rocks with the sea-floor assembly occurred at 2.685 Ga. and probably records the oldest Himalayan-type orogeny in Earth History.  The Webb Canyon gneiss, an orthogneiss that was emplaced in several events between 2.664 and 2.661 Ga, intrudes this whole sequence of rocks.

The Rendezvous domain consists of a complex sequence of paragneiss and orthogneiss, and metagabbro.  Granodioritic orthogneiss from this domain dates from 2.8 Ga, this age is similar to orthogneisses in the Wind River Range but is far older than the oldest age obtained from the Moose Basin domain.  Paragneisses at Paintbrush divide have detrital zircons that range in age from 2.700-2.650 Ga.  These ages clearly indicate that the sedimentary parent to the paragneiss was deposited after the high-pressure metamorphism in the north.  Sphene from the sheared Rendezvous gabbro in the southern domain gives ages of 2.623 Ga. and 2.616 Ga. the older age is identical with sphene age obtained from a dike in the Moose Basin domain.  These data imply that the Moose Basin domain and and the Rendezvous domain evolved independently between 2.8 Ga. and 2.65  Ga and were tectonically juxtaposed around 2.62 Ga.  This 2.62 Ga tectonic event is likely the same one that affected the whole southern portion of the Wyoming province at this time.


May 6 (Tuesday), 6:00 p.m., Teton Co. Library Auditorium - Open to Public. Presentation: " Unconventional Energy in Your Future”.  by Tom Drean, Director, Wyoming State Geological Survey.

Wyoming provides a significant amount of energy to the United States. In fact the over 10 quadrillion BTU's it provides annually means that if Wyoming was a country itself it would be the third largest energy exporter in the world. Over the last few years the development of "unconventional" oil and gas resources in the United States has become so significant that the unconventional is now becoming conventional. How this will impact Wyoming’s future budgets, the future development of Wyoming's many resources, and the overall development of resources on public and private lands across the State and indeed the country is significant and generally not well understood by the public. This talk will provide the audience with the knowledge to be an informed citizen of our State.


 May 20 (Tuesday), 6:00 p.m., Teton Co. Library Auditorium - Open to Public. Presentation: " Trona Mining in Wyoming”.  by Paul Peterson & Jon Peterson, Tata Chemicals, WY.

While Wyoming is known for many superlatives, e.g. having the world’s 1st national park (Yellowstone), did you know that it is the source of almost all of one of the most widely used and important commodities in the United States? This is trona, or soda ash, which being used by so many US industries is considered a benchmark for the condition of the US economy. It is used to make glass, used in the production of paper, soaps, baking soda, water softeners, pharmaceuticals, and more. Wyoming has the world’s largest resource of trona, deposited 40-50 million years ago in what was a sub-tropical, ancient shallow fresh water lake.  In 2012 the trona industry produced 17 million tons for which Wyoming received nearly $90 million in taxes & royalties  -  a significant part of the reason we pay no state income tax in Wyoming.

Come to this talk by Paul Peterson, of Tata Chemicals, one of the major trona producers in SW Wyoming to be taken on a tour of this resource that so few know anything about, but which is so tremendously important not only to Wyoming, but truly to the entire United States.

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Geo Links

Links to information and favorite websites of our members.

A new links of interest:

Quality illustrations of of Mesozoic Animals

3D Virtual Tours Around the World

April 5, 2014

Past Programs and EventsPast_Programs_and_Events.html2014_Calendar.htmlshapeimage_2_link_0shapeimage_2_link_1

Jeffery Johnson

February 18, 2014

Listening To Volcanoes

Rod Newcomb & Jamie Yount

January 21, 2014

Avalanches in Teton County

WYDOT Avalanche Control

John Hebberger, Jr. and John Willott

October 15, 2013

Wyoming’s Energy Storehouse