Point Lookout Sandstone
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| Point Lookout Sandstone | |
|---|---|
| Stratigraphic range: | |
| Lua error in package.lua at line 80: module 'Module:InfoboxImage/data' not found. Point Lookout, Mesa Verde National Park | |
| Type | Formation |
| Unit of | Mesaverde Group |
| Sub-units | Hosta Tongue |
| Underlies | Menefee Formation |
| Overlies | Crevasse Canyon Formation |
| Thickness | 300 ft (91 m) |
| Lithology | |
| Primary | Sandstone |
| Other | Shale |
| Location | |
| Coordinates | Lua error: callParserFunction: function "#coordinates" was not found. |
| Region | Paradox Basin, San Juan Basin |
| Country | United States |
| Type section | |
| Named for | Point Lookout |
| Named by | A. J. Collier |
| Year defined | 1919 |
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The Point Lookout Sandstone is a Cretaceous bedrock formation occurring in New Mexico and Colorado.
Description
The formation consists of two informal members. The lower is a sequence of thinly bedded sandstone and shale,Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. while the upper is a massive medium- to fine-grained cross-bedded sandstone, light gray to buff in color, that is a conspicuous cliff-forming unit.Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. Maximum thickness is 131 meters (430 feet).Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.
The lower contact is placed at the first thin sandstone bed above the shale of the Mancos Shale. The formation is overlain by the Menefee Formation.Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.
The Point Lookout Sandstone was deposited in the Cretaceous Interior Seaway, as part of a regressive sequence as the seaway was receding. It is transitional between the marine environment of the underlying Mancos and the coastal plain environment of the overlying Menefee Formation.
Fossils
Dinosaur remains are among the fossils that have been recovered from the formation, including a well preserved maniraptoran feather,[1] although none have yet been referred to a specific genus.Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.
The ammonite Clioscaphites vermiformis was identified in the formation.Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.
Resource geology
Exposures of the Point Lookout Sandstone at Apache Mesa in New Mexico contain heavy mineral deposits, rich in titanium, zirconium, rare earth elements, and other valuable metals. However, the deposits are much too small to be economical to mine as of 2021. The deposits represent a beach placer deposit similar to ones seen in the southeastern U.S. Atlantic coast, southeastern Australia, and India.Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.
History of investigation
The sandstone was first described by A. J. Collier for exposures in cliffs at Point Lookout, in Mesa Verde National Park, Montezuma County, Colorado, in the Paradox Basin,Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found. and later described by Allen and Balk in 1954 as part of the Mesaverde Group in the San Juan Basin in New Mexico.Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.
See also
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Footnotes
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- ^ Page Module:Citation/CS1/styles.css has no content.Williamson, T.E.; Kues, B.S.; Weissmann, G.S.; Stidham, T.A.; Yurchyk, S.L. (2009). "A feather from the Upper Cretaceous (lower Campanian) Point Lookout Sandstone, San Juan Basin, northwestern New Mexico". Cretaceous Research. 30: 547–550. doi:10.1016/J.CRETRES.2008.10.003. S2CID 128818922.
References
- Page Module:Citation/CS1/styles.css has no content.Allen, J.E.; Balk, Robert (1954). "Mineral Resources of Fort Defiance and Tohatchi quadrangles, Arizona and New Mexico". New Mexico Bureau of Mines and Mineral Resources Bulletin. 36. Retrieved 25 March 2021.
- Page Module:Citation/CS1/styles.css has no content.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. Retrieved 4 June 2020.
- Page Module:Citation/CS1/styles.css has no content.Collier, A.J. (1919). "Coal south of Mancos, Montezuma County, Colorado". Contributions to Economic Geology, 1918; Part 2, Mineral Fuels: U.S. Geological Survey Bulletin. 691-K: K293–K310. doi:10.3133/b691K.
- Page Module:Citation/CS1/styles.css has no content.Lucas, Spencer G.; Heckert, Andrew B. (2005). "Mesozoic stratigraphy at Durango, Colorado" (PDF). New Mexico Geological Society Field Conference Series. 56. Retrieved 8 June 2020.
- Page Module:Citation/CS1/styles.css has no content.McLemore, V.T. (2017). "Heavy mineral, beach-placer sandstone deposits at Apache Mesa, Jicarilla Apache Reservation, Rio Arriba County, New Mexico" (PDF). New Mexico Geological Society Field Conference Series. 68: 123–132. Retrieved 25 March 2021.
- Page Module:Citation/CS1/styles.css has no content.Tschudy, R.H. (1976). "Palynology of Crevasse Canyon and Menefee Formation of San Juan basin, New Mexico" (PDF). In Beaumont, E.C.; Shomaker, J.W.; Stone, W.J. (eds.). Guidebook to coal geology of northwest New Mexico: New Mexico Bureau of Mines and Mineral Resources Circular. Vol. 154. pp. 48–55. Retrieved 25 March 2021.
- Page Module:Citation/CS1/styles.css has no content.Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004). The Dinosauria (2nd ed.). Berkeley: University of California Press. ISBN 0-520-24209-2.
