| Sly Gap Formation | |
|---|---|
| Stratigraphic range: Frasnian PreꞒ Ꞓ O S D C P T J K Pg N | |
| 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 / 33.3322; -106.4574 |
| Region | New Mexico |
| Country | United States |
| Type section | |
| Named by | F.V. Stevenson |
| Year defined | 1945 |
  Sly Gap Formation (the United States)Show map of the United States Sly Gap Formation (New Mexico)Show map of 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.
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 or the Contadero Formation. It pinches out in the west in the Basin and Range province.
Fossils
The formation includes crinoidal siltstone beds and many other beds are fossiliferous, bearing crinoid, brachiopod, bryozoan, anthozoan, cephalopod, gastropod, fish, and coral remains.
See also
Footnotes
- ^ Stevenson 1945.
- ^ Kues 2004.
References
- Cooper, G.A.; Dutro, J.T. Jr. (1982). "Devonian brachiopods of New Mexico". Bulletins of American Paleontology. 82–83 (325).
- Kues, B.S. (2004). "Devonian of New Mexico". In Mack, G.H.; Giles, K.A. (eds.). The geology of New Mexico. A geologic history: New Mexico Geological Society Special Volume 11. pp. 59–75. ISBN 9781585460106.
- Stevenson, Frank V. (July 1945). "Devonian of New Mexico". The Journal of Geology. 53 (4): 217–245. doi:10.1086/625283.