| Salt Lake Formation | |
| Type: | Formation |
| Age: | Miocene-Pliocene |
| Region: | Idaho and Utah |
| Country: | United States |
The Salt Lake Formation is a geologic formation exposed principally in Northern Utah and Southeast Idaho, with other small exposures in Southwest Wyoming and Northeast Nevada. Dates generally range from mid-Miocene to early Pliocene, with most dates falling between 10 Ma to 4 Ma, but perhaps starting as early as 15 Ma and extending to as late as 2 Ma in places. The primarily sedimentary record preserves lacustrine and alluvial fan environments, as well as a few tuffaceous expressions. Preserved fossils include Blancan fauna.