3-D GEOLOGICAL MODELING OF THE CENTRAL TETON RANGE, WYOMING

We created a 3-D geological model of the central Teton Range in Wyoming using Earthvision software. The purposes of the model were to determine subsurface geometries of faults and contacts, and to develop methods to create stratigraphic and structural models in areas of high relief solely from surficial data (the geologic map). The Tetons are a classic Basin and Range horst that exhumed part of the older Laramide Gros Ventre – Tetons uplift, resulting in Archean rocks being uplifted to elevations over 13,000 feet. The model includes the recent Teton fault on the east and a Laramide reverse fault just west of the range crest. We created a reference horizon to define overall strata shapes using the great unconformity at the base of the Cambrian Flathead Sandstone. We then calculated the thicknesses to other contacts using the geologic map, then extrapolated those contacts into the air or into the subsurface from the reference horizon to provide additional control points. To model Precambrian granites and metamorphic rocks, we created vertical contacts for lack of more detailed information. The model shows that the apparently simple westward-tilted strata on the west side have considerable structural and stratigraphic variability that is not readily apparent on the geologic map. The reverse fault dips moderately eastward under the high peaks, and has displacement of at least several km.