| Fossil Mountain | |
| Elevation Ft: | 10921 |
| Elevation Ref: | [1] |
| Prominence Ft: | 756 |
| Location: | Caribou-Targhee National Forest, Teton County, Wyoming, U.S. |
| Range: | Teton Range |
| Map: | USA Wyoming |
| Label Position: | right 433913N 1105508W |
| Map Size: | 225 |
| Coordinates: | 43.6536°N -110.9189°W |
| Coordinates Ref: | [2] |
| Topo: | USGS Mount Bannon |
Fossil Mountain is located in the Teton Range, within the Jedediah Smith Wilderness of Caribou-Targhee National Forest, U.S. state of Wyoming.[3]
As mapped by J. D. Love and others, the upper peak of Fossil Mountain consists of relatively flat-lying beds of the Mississippian Madison Limestone and underlying Devonian Darby Formation.[4] [5] Underlying the Darby Formation and exposed in shear clifts and floors of glacially modfied valleys are the Ordovician Bighorn Dolomite and Cambrian Gallatin Formation. In all, ther is about 2700feet of lower and middle Paleozoic sedimentary strata exposed within the area of Fossil Mountain.
The study of the sedimentary strata within the Teton Mountains, show that these strata consist of limestones and dolomites. The Madison Limestone consists of a basal, dark-colored, fine-grained dolomitic limestone overlain by hundreds of feet of gray limestone that is classified as fossiliferous oosparite and fossiliferous pelsparite.[6] Abundant fossil shells and corals have been reported from the Madison Limestone at Fossil Mountain.[7] Underlying the Madison Limestone, the Darby Formation consists predominantly of dolomite and limestone that commonly contain discontinous layers of calcareous shale or sandstone.[6]