Word Formation
Stratigraphic range: Roadian-Wordian
~272–265.1 Ma

PreЄ

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]

## Contents

* 1 Defining formation
* 2 Subdivisions
* 3 Fossil content
* 3.1 Vertebrate paleofauna
* 4 See also
* 5 References
* 6 Further reading

## 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

1. ↑ 1.0 1.1 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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