Mesaverde Group

The Mesaverde Group is a Late Cretaceous stratigraphic group found in areas of Colorado, New Mexico, Utah, and Wyoming, in the Western United States.

Mesaverde Group
Stratigraphic range: Late Cretaceous
Mesaverde Group beds in the Book Cliffs near Helper, Utah.
TypeGroup
Sub-unitsSee text
UnderliesLewis Shale, Meeteetse Formation, Datil Group (regionally)
OverliesCody Shale, Mancos Shale
Thickness200–400 metres (660–1,310 ft)
Lithology
Primarysandstone and shale
Othercoal
Location
ExtentNew Mexico, Utah, Wyoming
Type section
Named forMesa Verde, Colorado
Named byW.H.Holmes (1877)
Stratigraphic column showing the relationship of the Mesaverde Group
Mesaverde Gas Fields within the Uinta Basin and Piceance Basin

History

The Mesaverde Formation was first described by W.H.Holmes in 1877 during the Hayden Survey. Holmes described the formation in the northern San Juan Basin as consisting of three units, which were a "Lower Escarpment" consisting of 40 m of ledge- and cliff-forming massive sandstone; a "Middle Coal Group" consisting of up to 300 m of thick slope-forming sandstone, shale, marl, and lignite; and an "Upper Escarpment" consisting of 60 m of ledge- and cliff-forming sandstone.[1] A.J. Collier redesignated these units in 1919 as the Point Lookout Sandstone, the Menefee Formation, and the Cliff House Sandstone, and raised the Mesaverde Formation to group rank.[2]

The group was later traced to the greater Green River Basin[3], the Uintah and Piceance Basins,[4] the Bighorn Basin,[5], the Front Range,[6], the Zuni Basin,[7], the Wasatch Plateau.[8], Wind River Basin,[9] Washakie Basin,[10] and the Powder River Basin.[11] It is spectacularly exposed along the Book Cliffs of eastern Utah and western Colorado.[12] With the recognition of the vast extent of the group, the group has been divided into formations by region, with the original Point Lookout Sandstone, Menefee Formation, and Cliff House Sandstone being restricted largely to the San Juan Basin and the Madrid, New Mexico area.

Geology

The group is a single regression-transgression sequence in its type location in the San Juan Basin, dividing the older marine Mancos Shale and younger Lewis Shale deposited in the Western Interior Seaway. The Point Lookout Sandstone represents the regression, the Menefee Formation the subsequent fluvial delta deposits, and the Cliff House Sandstone the return of the sea. In other locations, such as along the Book Cliffs, the picture is more complicated, with multiple regression-transgression sequences from tectonic activity along the Sevier mountain front.[13] In the Cody area, the group is a simple regression sequence and remains at formation rank. Here the group is described as interbedded light gray sandstone and gray shale in the upper part; massive, light-buff, ledge-forming sandstone containing thin lenticular coal beds in the lower part.[14]

Formations

northern Piceance Basin:[15]

southwestern Piceance Basin:[15]

  • Hunter Canyon Formation
  • Mount Garfield Formation

Powder River Basin:[11]

  • Teapot Sandstone
  • Parkman Sandstone

San Juan Basin:[2]

  • Point Lookout Sandstone
  • Menefee Formation
  • Cliff House Sandstone

Uintah Basin:[16]

Washakie Basin:[17]

Fossils

Dinosaur remains are among the fossils that have been recovered from the group, although none have yet been referred to a specific genus.[18] Deinosuchus has also been reported from Mesaverde outcrops in Wyoming.[19]

gollark: "thus far" just means "so far".
gollark: pole (telephone)
gollark: pole ([DATA EXPUNGED])
gollark: pole (geographic)
gollark: Spacechem.

See also

Footnotes
  1. Holmes 1877
  2. Collier 1919
  3. Fenneman and Gale 1906
  4. Lee 1909
  5. Lupton 1916
  6. Ball 1924
  7. Sears 1925
  8. Spieker and Reeside 1925
  9. Barwin 1959
  10. Hale 1961
  11. Fox 1993
  12. Fillmore 2011, p.224
  13. Fillmore 2011, p.240 et seq.
  14. Pierce 1997
  15. Johnson 1989
  16. Fouch et al. 1992
  17. Roehler 1987
  18. Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
  19. Wahl, W., Hogbin, J., 2003. Deinosuchus material from the Mesaverde Formation of Wyoming: filling in a gap. Journal of Vertebrate Paleontology 23 (supp to 3), 107A

References
  • Ball, M.W., 1924, Gas near Fort Collins, Colorado: American Association of Petroleum Geologists Bulletin, v. 8, no. 1, p. 79-87. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]
  • Barwin, J.R., 1959, Facies of the Mesaverde formation, east-central Wyoming, IN Geological record: American Association of Petroleum Geologists, Rocky Mountain Section, 9th annual meeting, February, 1959, p. 139-142.
  • 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.
  • Fenneman, N.M., and Gale, H.S., 1906, The Yampa coal field, Routt County, Colorado: U.S. Geological Survey Bulletin, 297, p. 7-81.
  • Fillmore, Robert (2011). Geological evolution of the Colorado Plateau of eastern Utah and western Colorado, including the San Juan River, Natural Bridges, Canyonlands, Arches, and the Book Cliffs. Salt Lake City: University of Utah Press. pp. 224, 247–248. ISBN 978-1-60781-004-9.
  • Fox, J.E., 1993, Stratigraphic cross sections showing electric logs of Upper Cretaceous and older rocks, Powder River basin, southeastern Montana and northeastern Wyoming: U.S. Geological Survey Oil and Gas Investigations Chart, OC-135 to OC-138., Sections A-A' through F-F'; G-G' through L-L'; M-M' through R-R'; S-S' through V-V'
  • Fouch, T.D., Nuccio, V.F., Osmond, J.C., MacMillan, Logan, Cashion, W.B., and Wandrey, C.J., 1992, Oil and gas in uppermost Cretaceous and Tertiary rock, Uinta basin, Utah, IN Fouch, T.D., Nuccio, V.F., and Chidsey, T.C., Jr., eds., Hydrocarbon and mineral resources of the Uinta basin, Utah and Colorado; 1992 field symposium: Utah Geological Association Guidebook, no. 20, p. 9-48.
  • Hale, L.A., 1961, Late Cretaceous (Montanan) stratigraphy eastern Washakie basin, Carbon County, Wyoming, IN Wiloth, G.J., and others, eds., Symposium on Late Cretaceous rocks, Wyoming and adjacent areas: Wyoming Geological Association Field Conference Guidebook, no. 16, p. 129-137.
  • Holmes, W.H., 1877, Report [on the San Juan District, Colorado], IN Hayden, F.V., Ninth annual report of the United States Geological and Geographical Survey of the Territories, embracing Colorado and parts of adjacent territories, being a report of progress of the exploration for the year 1875; Part I, Geology: U.S. Geological and Geographical Survey of the Territories (Hayden), Annual Report, 9, p. 237-276, pls. 34-49., Reprint, 1873
  • Johnson, R.C., 1989, Geologic history and hydrocarbon potential of Late Cretaceous-age, low-permeability reservoirs, Piceance basin, western Colorado, IN Evolution of sedimentary basins; Uinta and Piceance basins: U.S. Geological Survey Bulletin, 1787-E, p. E1-E51.
  • Lee, W.T., 1909, The Grand Mesa coal field, Colorado: U.S. Geological Survey Bulletin, 341, p. 316-334.
  • Lupton, C.T., 1916, Oil and gas near Basin, Big Horn County, Wyoming, IN Contributions to economic geology, 1915; Part 2, Mineral fuels: U.S. Geological Survey Bulletin, 621-L, p. L157-L190.
  • Pierce, W.G., 1997, Geologic map of the Cody 1 degree x 2 degrees quadrangle, northwestern Wyoming: U.S. Geological Survey, Miscellaneous Geologic Investigations Map I-2500, scale 1:250000.
  • Roehler, H.W., 1987, Surface-subsurface correlations of the Mesaverde Group and associated Upper Cretaceous formations, Rock Springs, Wyoming to Mount Harris, Colorado: U.S. Geological Survey Miscellaneous Field Studies Map, MF-1937, scale 1 in. = 200 ft.
  • Spieker, E.M., and Reeside, J.B., Jr., 1925, Cretaceous and Tertiary formations of the Wasatch Plateau, Utah: Geological Society of America Bulletin, v. 36, no. 3, p. 435-454.
  • 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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