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]
| 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) | |
Description
editThe 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
editThe formation includes crinoidal siltstone beds and many other beds are fossiliferous, bearing crinoid, brachiopod, bryozoan, anthozoan, cephalopod, gastropod, fish, and coral remains.[1]
See also
edit
Footnotes
editReferences
edit- 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.