Seven Rivers Formation

The Seven Rivers Formation is a geologic formation in southeastern New Mexico and west Texas. It preserves fossils dating back to the late Guadalupian Epoch of the Permian period.[1]

Seven Rivers Formation
Stratigraphic range: Guadalupian
TypeFormation
Thickness400–1,970 feet (120–600 m)
Location
Coordinates32.497°N 104.256°W / 32.497; -104.256
RegionNew Mexico
CountryUnited States
Seven Rivers Formation (the United States)
Seven Rivers Formation (New Mexico)

Description

The formation consists of 400–1,970 feet (120–600 m)[2][1] of anhydrite, with interbeds of shale, dolostone, siltstone, and sandstone. It rests on the Queen Formation and is overlain by the Yates Formation. The Seven Rivers Formation is part of the Artesia Group, which is interpreted as a sequence of shelf rocks.[1]

History of investigation

The unit was first named as the Seven Rivers Member of the (now abandoned) Chupadera Formation by Meinzer et al. in 1927.[3] In 1937, Lang assigned the Seven Rivers Member to the (now abandoned) Chalk Bluff Formation and removed its upper beds to the Three Twins Member.[4] The unit was promoted to formation rank and assigned to the Whitehorse Group by DeFord and Lloyd in 1940.[5] Newell et al. assigned the formation to the (now abandoned) Carlsbad Group in 1953,[6] and it was assigned to the Artesia Group by Tait et al. in 1962.[1]

See also

Footnotes
  1. Tait et al. 1962
  2. Hayes and Koogle 1958
  3. Meinzer et al. 1927
  4. Lang 1937
  5. Deford and Lloyd 1940
  6. Newell et al. 1953

References
  • DeFord, Ronald K.; Lloyd, E. Russel (1940). "West Texas-New Mexico Symposium: Part I Editorial Introduction". AAPG Bulletin. 24. doi:10.1306/3D933188-16B1-11D7-8645000102C1865D.
  • Hayes, P.T.; Koogle, R.L. (1958). "Geology of the Carlsbad Caverns West quadrangle, New Mexico-Texas". U.S. Geological Survey Geologic Quadrangle Map. GQ-112.
  • Lang, W.B. (1937). "The Permian formations of the Pecos Valley of New Mexico and Texas". American Association of Petroleum Geologists Bulletin. 21 (7): 833–898. doi:10.1306/3D932EDE-16B1-11D7-8645000102C1865D.
  • Meinzer, O.E.; Renick, B.C.; Bryan, Kirk (1927). "Geology of No. 3 reservoir site of the Carlsbad Irrigation Project, New Mexico, with respect to water tightness". U.S. Geological Survey Water-Supply Paper. 580-A.
  • Newell, N.D., Rigby, J.K., Fischer, A.G., Whiteman, A.J., HIckox, J.E., and Bradley, J.S., 1953, The Permian reef complex of the Guadalupe Mountains region, Texas and New Mexico; a study in paleoecology: San Francisco, W.H. Freeman and Company
  • Tait, D.B.; Motts, W.S.; Spitler, M.E. (1962). "Artesia Group of New Mexico and West Texas". American Association of Petroleum Geologists Bulletin. 46 (4): 504–517. doi:10.1306/BC74383B-16BE-11D7-8645000102C1865D.
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