Point Lookout Sandstone
| Point Lookout Sandstone Stratigraphic range: Upper Cretaceous | |
|---|---|
| Type | sedimentary |
| Unit of | Mesaverde Group |
| Overlies | Crevasse Canyon Formation |
| Lithology | |
| Primary | sandstone |
| Location | |
| Region | Paradox Basin, San Juan Basin |
| Country | United States |
| Type section | |
| Named by | A. J. Collier, 1919[1] |
The Point Lookout Sandstone is a Cretaceous bedrock formation occurring in New Mexico and Colorado.
Description
The sandstone was first described by A. J. Collier for exposures in cliffs at Point Lookout, Montezuma County, Colorado, in the Paradox Basin,[1] and later described by Allen and Balk in 1954 as part of the Mesaverde Group in the San Juan Basin in New Mexico.[2]
The formation was described by Cather (2010) as "Light gray to buff medium to finegrained, cross-bedded sandstone."[3]
Fossils
Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.[4]
The ammonite Clioscaphites vermiformis was identified in the formation.[5]
See also
Footnotes
- 1 2 Collier, A.J., 1919, Coal south of Mancos, Montezuma County, Colorado, IN Contributions to economic geology, 1918; Part 2, Mineral fuels: U.S. Geological Survey Bulletin, 691-K, p. K293-K310.
- ↑ Allen, J.E., and Balk, Robert, 1954, Mineral Resources of Fort Defiance and Tohatchi quadrangles, Arizona and New Mexico: New Mexico Bureau of Mines and Mineral Resources Bulletin, no. 36, 192 p.
- ↑ Cather, Steven, 2010, Preliminary geologic map of the San Lucas Dam quadrangle, McKinley County, New Mexico: New Mexico Bureau of Geology and Mineral Resources, Open-File Geologic Map OF-GM 212, scale 1:24000.
- ↑ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
- ↑ Tschudy, R.H., 1976, Palynology of Crevasse Canyon and Menefee Formation of San Juan basin, New Mexico, IN Beaumont, E.C., Shomaker, J.W., and Stone, W.J., compilers, Guidebook to coal geology of northwest New Mexico: New Mexico Bureau of Mines and Mineral Resources Circular, no. 154, p. 48-55.
References
- Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.
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