Stanley P Mordensky, PhD

Map of the geologic domains of the Greater Yellowstone Ecosystem (GYE). Boundaries are approximate.

Comparison of steep subduction (like that occurring today beneath the Pacific Northwest of the United States) and flat-slab subduction (which led to the formation of the Rocky Mountains a few tens of millions of years ago). Black arrows indicate the relative direction of movement of the oceanic plate.

Map of areas predicted as having conditions favorable for fostering a hydrothermal system in the western United States.  Black dots are mapped hydrothermal systems.  From Mordensky et al., 2023 (https://www.sciencedirect.com/science/article/pii/S0375650523000160).

A garter snake along Violet Creek near the Mary Mountain Trail in Hayden Valley, Yellowstone National Park. This snake used the geothermally warmed creek to thermoregulate during near-freezing overnight conditions. USGS photo by Stanley Mordensky, June 2023.

View of dead lodgepole pine trees with “bobby socks” from having taken up hydrothermal water that contains dissolved silica and other minerals. Photo taken south of the Fountain Paint Pot Trail in Lower Geyser Basin, Yellowstone National Park, looking toward the southeast. USGS photo by Stanley Mordensky, August 28, 2020.

Granite Peak (center) as seen from the north flank of Tempest Mountain. Note: The photographer did not approach this mountain goat. Instead, the mountain goat, which has likely learned to associate human behavior as a source of sodium (a common problem throughout the region), approached the photographer. USGS photo by Stanley Mordensky, August 2020.

View of Twin Peaks (left-most prominent peak), Mt. Hague (second-left-most prominent peak), and Mt.

Sheep Mountain, in the Gallatin Range, as seen from the north along the Sky Rim Trail near Sunlight Creek (to the left is approximately east, and to the right is approximately west). Note the layered stratigraphy of the sedimentary rocks dipping to the west. USGS photo by Stanley Mordensky, August 2020.

View of the Cirque of the Towers in the Wind River Range, with Pingora Peak in the center. The Bull Lake and Pinedale glaciations carved this valley by steepening and smoothing its granite walls. Image captured while descending from Texas Pass. Image view is toward the southwest. USGS photo by Stanley Mordensky, August 2019.

Simplified geologic map detailing locations of volcanics at Sepulcher Mountain and igneous intrusion at Electric Peak and surrounding area. This map is Fig. 2.

Geologic map of the Wind River Range from Blackstone, 1993 (The Wind River Range, Wyoming: An Overview. Wyoming Geological Association. Jubilee Anniversary Field Conference Guidebook: Wyoming Geology, Past, Present, and Future. Pg. 121-140).