Word Formation Explained
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
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
Notes and References
- https://paleobiodb.org/classic/displayStrata?geological_group=&formation=Word&group_formation_member=Word Word Formation
- https://ngmdb.usgs.gov/Geolex/UnitRefs/WordRefs_11238.html Word Formation
- https://paleobiodb.org/classic/displayCollResults?collection_no=105683 Old Word Ranch, Glass Mountains
- https://paleobiodb.org/classic/displayCollResults?formation=Word&member=Appel%20Ranch Appel Ranch member
- https://paleobiodb.org/classic/displayCollResults?formation=Word&member=China%20Tank China Tank member
- https://paleobiodb.org/classic/displayCollResults?formation=Word&member=Willis%20Ranch Willis Ranch member
