Sly Gap Formation
Geologic formation in New Mexico, US
From Wikipedia, the free encyclopedia
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]
TypeFormation
UnderliesPercha Formation, Contadero Formation
OverliesOnate Formation
Thickness114 feet (35 m)
| 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 | 33.3322°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) | |
Description
The formation consists of about 114 feet (35 m) of brown, yellow, or gray limestone and siltstone and brown to greenish-gray shale. It disconformably overlies the Onate Formation and is overlain by the Percha Formation[1][2] or the Contadero Formation.[2] It pinches out in the west in the Basin and Range province.[1]
Fossils
The formation includes crinoidal siltstone beds and many other beds are fossiliferous, bearing crinoid, brachiopod, bryozoan, anthozoan, cephalopod, gastropod, fish, and coral remains.[1]
