The Word Formation is a geologic formation in Texas.[ 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.[ Word Formation by USGS, retrieved 5 January 2017]
Defining formation
The
Wordian age of the
Permian Period is named for the Word Formation.
[ Old Word Ranch, Glass Mountains at Fossilworks.org]
Subdivisions
The formation is subdivided into three members, from young to old:
Fossil content
The
limestone formation contains marine
,
and
.
[
]
Vertebrate paleofauna
See also
-
List of fossiliferous stratigraphic units in Texas
-
Paleontology in Texas
Further reading
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M. Kelly and R. Zangerl. 1976. Helicoprion (Edestidae) in the Permian of West Texas. Journal of Paleontology 50(5):992-994
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G. A. Cooper and R. E. Grant. 1972. Permian brachiopods of west Texas, I. Smithsonian Contributions to Paleobiology 14:1-231
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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
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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
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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
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F. B. Plummer and G. Scott. 1937. Upper Paleozoic ammonites in Texas. The University of Texas Bulletin 3701:1-516
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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
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G. H. Girty. 1909. The Guadalupian fauna. United States Geological Survey Professional Paper 58:1-651
