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

Recent Presentations

Geologists of Jackson Hole

July and August 2014 public programs

In conjunction with Teton Co. Library

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


 _July 15 (Tuesday), 6 p.m., Teton Co. Library Auditorium - Open to Public. Presentation: " Evolution of the Sevier and Laramide mountain belts: Wyoming’s changing landscape”. Presented by Adolph Yonkee, Professor, Weber State University.

Would you like to understand the mountains one sees from the Idaho to S. Dakota/Nebraska borders?  Having studied Wyoming geology for many years, and now working as well in a place with similar geology (Argentina), Dr. Yonkee can provide you with that understanding. He will take his audience on a tour of Wyoming's Sevier and Laramide mountain belts and end with some comparisons to what he is studying in Argentina. Wyoming's mountains record a long and varied geologic history, from initial deposition of sedimentary rocks across an ancient rifted plate margin, to uplift of a complex mountain system, to erosion and final collapse. In this talk he will explore how the primary architecture of the crust influenced patterns of subsequent deformation, how changes in rates of plate motion and terrane accretion during Andean-style subduction controlled patterns of mountain building, and how the landscape you see today is but one frame in a fantastical movie, holding clues of the past and portents of the future. This talk focuses on results of recent studies across the “thin-skin” Sevier fold-thrust and “thick-skin” Laramide belts, and develops a model relating changing styles, timing, and locations of mountain building across Wyoming, finishing with a comparison to the actively forming Andes of Argentina.

August 5 (Tuesday), 6 p.m., Teton Co. Library Auditorium - Open to Public. Presentation: "World’s Largest Eruption since 1912:  Mount Pinatubo, 1991”. Presented by Robert I. Tilling, Volcanologist Emeritus, Volcano Science Center, U.S. Geological Survey.

The 1912 Novarupta-Katmai eruption (Alaska)—the most voluminous in the world in the 20th century—was surpassed in size during all of recorded history only by the 1815 eruption of Tambora Volcano (Indonesia).  Luckily, because Alaska is a sparsely populated region, the Novarupta eruption, though huge, caused only a single fatality and minimal socioeconomic impact.  The powerful eruption in 1991 of Mount Pinatubo (Philippines) was a quite different, and much more challenging, story.  It was the world’s first major eruption to affect a densely populated region, with about a million people exposed to potential volcanic hazards.  Yet, despite the great number of people at risk in the region, there were remarkably few fatalities given the enormous size of the eruption.  This fortunate outcome was not due to good luck but rather was the result of intensive monitoring of Mount Pinatubo, combined with effective communications of hazards information to people living around the volcano.  A forecast made by the on-site scientific team, composed of members from the Philippine Institute of Volcanology and Seismology and the U.S. Geological Survey, was given to authorities three days before the climactic eruption (15 June).  Acting on this forecast, government officials carried out timely evacuations of more than 300,000 people from hazardous zones.  Thousands of lives were saved and hundred of millions of dollars in property losses were averted.  In his lecture, Bob Tilling will review the chronology and impacts of the eruption, emphasizing the effective response—by scientists and emergency-management officials—during the volcanic crisis.  The 1991 Mount Pinatubo eruption arguably is THE volcanological “success story” of the 20th century in reducing risk from volcanic hazards.

August 19 (Tuesday), 6 p.m., Teton Co. Library Auditorium - Open to Public. Presentation: " Yellowstone: What’s Happening Right Now and Latest Geo Discoveries”. Presented by Bob Smith & Jamie Farrell, University of Utah.

User friendly methods for recording and viewing real-time seismic and ground deformation (GPS) data have been developed for real-time algorithms that allow public access to data recorded from the Yellowstone seismic and GPS network.  A discussion will include PC/Mac software, modern methods of monitoring, earthquake and volcano notification, global earthquake display, catalogs, of data, etc.  I will also show updates on our research including how the global scale Yellowstone plume fuels the crustal magma reservoir that in turn supplies the enormous heat flux, youthful volcanism and the hydrothermal system of Yellowstone.  Using the above data I will describe new discoveries on the much larger sizes of the plume and the magma chamber, the continuous nature of earthquake shaking of Yellowstone, and how these processes affect the probabilistic seismic hazard.

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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

July 9, 2014

Past Programs and EventsPast_Programs_and_Events.html2014_Calendar.htmlshapeimage_2_link_0shapeimage_2_link_1

Dr. Barbara John

June 2014

Exploring the Undersea Wilderness

Tom Drean

May 2014

Unconventional Energy In Your Future

Ron Frost

April 2014

Precambrian Geology of the Teton Range

Ken Sims

March 2014

Clues to Dinosaur’s Demise

Volcanoes on the Verge

Jeffery Johnson

February 2014

Listening To Volcanoes

John Guslander

January 2014

Do It Yourself Geology in Jackson Hole

Rod Newcomb & Jamie Yount

January 2014

Avalanches in Teton County

WYDOT Avalanche Control

The Budge Drive Landslide
A Report By The Geologists of Jackson Hole
ABSTRACT: The Budge Drive landslide nucleated behind a steep rock face created by extensive quarrying from the late 1950s through the 1970s. This rock face has slopes up to 55 degrees, more than three times the 15-degree slopes typical in the region that had become stable over thousands of years. The presence of highly flow-foliated and fractured andesite resting on clays at the site means that water flowed readily downward through the andesite where it could then flow towards the valley floor on the underlying clay, providing a natural surface of potential slip. A high rate of precipitation and snow melt appears to have triggered rapid motion of this slide in 2014. But the fractures surrounding the slide mass began to form, nucleate, by the fall to winter of 2011. Nucleation could have been caused by a plumbing water leak in April, 2011, removal of additional quarry material during the summer of 2011, spontaneous failure resulting from the much earlier quarrying, or some combination of all of the above. The Town of Jackson and Teton County may wish to consider all of these factors while working towards a solution of the present landslide and while considering regulations and practices designed to minimize future instances of slope failure.

 Full Report.  For information on the core samples Slide CoresWelcome_files/Geologic%20Report%20Budge%20.pdfWelcome_files/SlideCores.pdfshapeimage_3_link_0shapeimage_3_link_1