Word Formation
{{Short description|Ecosystem}}
{{Use dmy dates|date=November 2018}}
{{About|the geological formation|the linguistics term|Word formation}}
{{Infobox rockunit
| name = Word Formation
| image = Leptodus100711.jpg
| caption = Fossil from the Word Formation
| type = Formation
| age = Roadian-Wordian
~{{fossil range|272|265.1}}
| period = Wordian
| prilithology = Limestone
| otherlithology =
| namedfor = Old Word Ranch
| namedby =
| region = Texas
| country = United States
| coordinates = {{coord|30.4|N|103.2|W|display=inline,title}}
| paleocoordinates = {{coord|1.6|N|33.0|W|display=inline}}
| unitof =
| subunits = Appel Ranch, China Tank & Willis Ranch members
| underlies =
| overlies = Road Canyon Formation
| thickness =
| extent = Glass Mountains
| area =
| map = {{Location map+ | United States#Texas
| relief = 1
| width = 250
| float = center
| places =
{{Location map~ | United States#Texas
| lat_deg = 30.4
| lon_deg = -103.2
| mark = Orange pog.svg
| marksize = 12
}}
}}
| map_caption =
}}
The Word Formation is a geologic formation in Texas.[https://paleobiodb.org/classic/displayStrata?geological_group=&formation=Word&group_formation_member=Word Word Formation] at Fossilworks.org 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.[https://ngmdb.usgs.gov/Geolex/UnitRefs/WordRefs_11238.html Word Formation] by USGS, retrieved 5 January 2017
Defining formation
The Wordian age of the Permian Period is named for the Word Formation.[https://paleobiodb.org/classic/displayCollResults?collection_no=105683 Old Word Ranch, Glass Mountains] at Fossilworks.org
Subdivisions
The formation is subdivided into three members, from young to old:
- Appel Ranch - Wordian[https://paleobiodb.org/classic/displayCollResults?formation=Word&member=Appel%20Ranch Appel Ranch member] at Fossilworks.org
- China Tank - Roadian[https://paleobiodb.org/classic/displayCollResults?formation=Word&member=China%20Tank China Tank member] at Fossilworks.org
- Willis Ranch - Roadian[https://paleobiodb.org/classic/displayCollResults?formation=Word&member=Willis%20Ranch Willis Ranch member] at Fossilworks.org
Fossil content
The limestone formation contains marine gastropods, brachiopods and ammonites.
= Vertebrate paleofauna =
See also
References
{{Reflist|30em}}
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
Category:Geologic formations of Texas
Category:Permian geology of Texas
Category:Limestone formations of the United States
Category:Shallow marine deposits
Category:Permian northern paleotropical deposits