Word Formation

Word Formation Stratigraphic range: Roadian-Wordian ~272–265.1 Ma PreЄ Є O S D C P T J K Pg N
Fossil from the Word Formation
Type	Formation
Sub-units	Appel Ranch, China Tank & Willis Ranch members
Overlies	Road Canyon Formation
Lithology
Primary	Limestone
Location
Coordinates	[ ⚑ ] : 30°24′N 103°12′W / 30.4°N 103.2°W / 30.4; -103.2
Paleocoordinates	[ ⚑ ] 1°36′N 33°00′W / 1.6°N 33.0°W / 1.6; -33.0
Region	Texas
Country	United States
Extent	Glass Mountains
Type section
Named for	Old 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

• Helicoprion davisii

See also

• List of fossiliferous stratigraphic units in Texas
• Paleontology in Texas

References

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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