Wayan Formation
| Wayan Formation | |
|---|---|
| Stratigraphic range: Albian-Cenomanian | |
Eggshell of the oogenus Macroelongatoolithus on a Wayan Formation outcrop. Image used courtesy of the USFS Paleontology Program | |
| Type | Geological formation |
| Underlies | Sage Junction Formation |
| Overlies | Smiths Formation |
| Thickness | 1,344 m (4,409 ft) in western Tincup Canyon area, Caribou County |
| Lithology | |
| Primary | Mudstone, sandstone |
| Other | Conglomerates, limestone & tuff |
| Location | |
| Region | Idaho |
| Country | United States |
| Extent | Caribou Range |
The Wayan Formation is a geological formation in Idaho whose strata date back to the latest Early Cretaceous and the earliest Late Cretaceous. Dinosaur, other reptile, mammal, and micro and macro-floral remains are among the fossils that have been recovered from the formation. The lack of extensive outcrops, limited geographic extent, and extreme structural deformation have limited paleontological explorations of the Wayan.