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: Frasnian
TypeFormation
UnderliesPercha Formation, Contadero Formation
OverliesOnate Formation
Thickness114 feet (35 m)
Lithology
Primarylimestone
Othersiltstone, shale
Location
Coordinates33°19′56″N 106°27′27″W / 33.3322°N 106.4574°W / 33.3322; -106.4574
RegionNew Mexico
CountryUnited States
Type section
Named byF.V. Stevenson
Year defined1945
Sly Gap Formation is located in the United States
Sly Gap Formation
Sly Gap Formation (the United States)
Sly Gap Formation is located in New Mexico
Sly Gap Formation
Sly Gap Formation (New Mexico)

Description

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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

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The 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

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Footnotes

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References

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  • 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.