| Sly Gap Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Formation |
| Underlies | Percha Formation, Contadero Formation |
| Overlies | Onate Formation |
| Thickness | 114 feet (35 m) |
| Lithology | |
| Primary | limestone |
| Other | siltstone, shale |
| Location | |
| Coordinates | 33°19′56″N 106°27′27″W / 33.3322°N 106.4574°W |
| Region | New Mexico |
| Country | United States |
| Type section | |
| Named by | F.V. Stevenson |
| Year defined | 1945 |
  Sly Gap Formation (the United States)  Sly Gap Formation (New Mexico) | |
The Sly Gap Formation is a geologic formation in south-central New Mexico. It preserves fossils dating back to the Frasnian Age of the late Devonian period.[1]