Word Formation

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Word Formation
Stratigraphic range: Roadian-Wordian
~272–265.1 Ma
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Fossil from the Word Formation
TypeFormation
Sub-unitsAppel Ranch, China Tank & Willis Ranch members
OverliesRoad Canyon Formation
Lithology
PrimaryLimestone
Location
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Approximate paleocoordinatesLua error: callParserFunction: function "#coordinates" was not found.
RegionTexas
CountryUnited States
ExtentGlass Mountains
Type section
Named forOld Word Ranch
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The Word Formation is a geologic formation in Texas.[1] It preserves fossils dating back to the Permian period. It is probably named for the Old Word Ranch in the Glass Mountains of Brewster County.[2]

Defining formation

The Wordian age of the Permian Period is named for the Word Formation.[3]

Subdivisions

The formation is subdivided into three members, from young to old:

  • Appel Ranch - Wordian[4]
  • China Tank - Roadian[5]
  • Willis Ranch - Roadian[6]

Fossil content

The limestone formation contains marine gastropods, brachiopods and ammonites.[1]

Vertebrate paleofauna

See also

References

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  1. ^ a b Word Formation at Fossilworks.org
  2. ^ Word Formation by USGS, retrieved 5 January 2017
  3. ^ Old Word Ranch, Glass Mountains at Fossilworks.org
  4. ^ Appel Ranch member at Fossilworks.org
  5. ^ China Tank member at Fossilworks.org
  6. ^ Willis Ranch member at Fossilworks.org

Further reading

  • M. Kelly and R. Zangerl. 1976. Helicoprion (Edestidae) in the Permian of West Texas. Journal of Paleontology 50(5):992-994
  • G. A. Cooper and R. E. Grant. 1972. Permian brachiopods of west Texas, I. Smithsonian Contributions to Paleobiology 14:1-231
  • R. L. Batten. 1958. Permian Gastropoda of the southwestern United States. 2. Pleurotomariacea: Portlockiellidae, Phymatopleuridae, and Eotomariidae. Bulletin of the American Museum of Natural History 114(2):153-246
  • E. L. Yochelson. 1956. Permian Gastropoda of the southwestern United States. 1. Euomphalacea, Trochonematacea, Pesudophoracea, Anomphalacea, Craspedostomatacea, and Platyceratacea. Bulletin of the American Museum of Natural History 110(3):173-276
  • A. K. Miller and W. M. Furnish. 1940. Permian ammonoids of the Guadalupe Mountain region and adjacent area. Geological Society of America Special Paper 26:1-242
  • F. B. Plummer and G. Scott. 1937. Upper Paleozoic ammonites in Texas. The University of Texas Bulletin 3701:1-516
  • R. E. King. 1931. The Geology of the Glass Mountains, Texas, Part II, Faunal summary and correlation of the Permian formations with description of Brachiopoda. The University of Texas Bulletin 3042:1-245
  • G. H. Girty. 1909. The Guadalupian fauna. United States Geological Survey Professional Paper 58:1-651
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