| Weeks Formation | |
|---|---|
| Stratigraphic range: | |
 Fossil from the Weeks Formation | |
| Type | Formation |
| Location | |
| Region | Utah |
| Country |  United States |
The Weeks Formation is a geologic formation in Utah. It preserves fossils dating back to the Cambrian period and more specifically the Guzhangian stage. Its upper part has yielded a diverse fauna dominated by trilobites and brachiopods, but also comprising various soft-bodied organisms, such as Falcatamacaris.[1] As such, it is regarded as a Konservat-Lagerstätte.
- ^ Lerosey-Aubril, Rudy; Gaines, Robert R.; Hegna, Thomas A.; Ortega-Hernández, Javier; Van Roy, Peter; Kier, Carlo; Bonino, Enrico (2018). "The Weeks Formation Konservat-Lagerstätte and the evolutionary transition of Cambrian marine life". Journal of the Geological Society. 175: 705–715. doi:10.1144/jgs2018-042.