Insights from surficial geologic mapping in northwest Wyoming

Presented by James Mauch, Wyoming State Geological Survey

October 4th (Tuesday), 6 p.m., Via Zoom (online) & Live at Teton County Library. Open to Public.

Northwest Wyoming is a region renowned for its dynamic and well-preserved Quaternary geology. For the past three years the Wyoming State Geological Survey has been mapping the surficial geology of the Jackson Lake and Ramshorn 30’ x 60’ quadrangles in an effort to better understand the region’s Quaternary geology and geologic hazards. This work is part of a broader effort to complete statewide surficial geologic mapping at scale of 1:100,000.

This talk will cover several of the notable findings from this mapping effort. Focus will be placed on the less-geologically famous, but equally remarkable, parts of the quadrangles, including easternmost Jackson Hole, the Gros Ventre River valley, the Union Pass to Togwotee Pass corridor, and the southern Absaroka Range. Key results include updated landslide mapping, newly documented Quaternary faults, and a reinterpretation of ice extents during the penultimate (Bull Lake) glaciation. These findings have implications for landslide susceptibility analyses and seismic hazard modeling, and they contribute to the growing body of knowledge about this region’s rich geologic history

Eastward view up the Gros Ventre River valley from near Grizzly Lake. The sharp, bare ridges in the foreground are Pinedale-age lateral moraines from glaciers that occupied East and West Miner creeks. In the background at the left is the Lavender Slide, a prominent earthflow complex.

A WSGS geologist maps large translational and rotational block slides along the southern escarpment of the Absaroka Range near Shoshone Pass. View is southward into the valley of East DuNoir Creek.

Topic: Insights from surficial geologic mapping in northwest Wyoming

Time: October 4th, 2022 06:00 PM Mountain Time (US and Canada)

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Meeting ID: 455 565 1818
Passcode: 576063