| 词条 | Mancos Shale |
| 释义 |
| name = Mancos Shale Formation | image = Mancos Shale badlands in Capitol Reef NP.jpg | caption = Mancos Shale badlands in Capitol Reef National Park, southern Utah. | type = Geologic formation | age = Mid Albian-Campanian ~{{Fossil range|110|80}} | period = Turonian | prilithology = Shale | otherlithology = | namedfor = Mancos, Colorado | namedby = | region = Arizona, Colorado, New Mexico, Utah, Wyoming | country = {{USA}} | coordinates = | unitof = | subunits = See text | underlies = Mesaverde Formation | overlies = Dakota Group | thickness = | extent = Basin and Range, Colorado Plateau & San Juan Mountains Provinces | area = | map = | map_caption = }} The Mancos Shale or Mancos Group is a Late Cretaceous (Upper Cretaceous) geologic formation of the Western United States. The Mancos Shale was first described by Cross and Purington in 1899[1] and was named for exposures near the town of Mancos, Colorado. GeologyIt is dominated by mudrock that accumulated in offshore and marine environments of the Cretaceous North American Inland Sea. The Mancos was deposited during the Cenomanian (locally Albian) through Campanian ages, approximately from 95 Ma to 80 Ma. Stratigraphically the Mancos Shale fills the interval between the Dakota Group and the Mesaverde Formation Group.[2]The Mancos Shale rests conformably on the Dakota and in its upper part grades into and intertongues with the Mesaverde Group. The shale tongues typically have sharp basal contacts and gradational upper contacts. The classification broadly correspondences with the Colorado Group classification of the Great Plains region; as such, various units of the Colorado Group are recognized within the Mancos.[3] OccurrencesThe Mancos occurs in the Basin and Range Province, the Colorado Plateau Province, and the San Juan Mountains Province. Structural basinsIt also occurs in the following structural basins:[4] SubunitsThe Mancos occurs with the following subunit names (listed alphabetically):[4] (bold: principle reference section at the type location)[6][7] See also{{Portal|Cretaceous|Paleontology|Earth sciences}}
References1. ^Cross, W. and Purington, C. W. (1899) "Description of the Telluride quadrangle, Colorado" United States Geological Survey Atlas, Folio 57 {{Chronostratigraphy of Colorado|Mesozoic state=expanded}}2. ^Weimer, R. J. (1960) "Upper Cretaceous Stratigraphy, Rocky Mountain Area" American Association of Petroleum Geologists Bulletin 44: pp. 1-20 3. ^{{cite journal |author= Charlse H. Rankin |title= Stratigraphy of the Colorado Group, Upper Cretaceous, in Northern New Mexico |journal= New Mexico Bureau of Mines and Mineral Resources Bulletins |issue= 20 |publisher= New Mexico School of Mines |url= https://geoinfo.nmt.edu/publications/monographs/bulletins/downloads/20/Bulletin020.pdf |page= 5 |access-date= 2018-08-13 |quote= ...that all divisions of the Colorado group (Mancos shale) as described in southern Colorado, except the Fort Hays lime-stone and the Apishapa shale, can be recognized in northern New Mexico. }} 4. ^1 "Colorado River Basin Stratigraphy: Mancos Shale" United States Geological Survey 5. ^[https://nmgs.nmt.edu/publications/guidebooks/downloads/56/56_p0218_p0226.pdf New Mexico Geological Association.edu: "SURFACE and SUBSURFACE STRATIGRAPHY of the BURRO CANYON FORMATION, DAKOTA SANDSTONE, and INTERTONGUED MANCOS SHALE of the CHAMA BASIN, NEW MEXICO"]; 2005. 6. ^{{cite journal|authors= R. Mark Leckie, James I. Kirkland, and William P. Elder|title= Stratigraphic Framework and Correlation of a Principle Reference Section of the Mancos Shale (Upper Cretaceous), Mesa Verde, Colorado|journal= 48th Annual NMGS Fall Field Conference Guidebook|volume = Mesozoic Geology and Paleontology of the Four Corners Area|url=https://nmgs.nmt.edu/publications/guidebooks/downloads/48/48_p0163_p0216.pdf|year= 1997|page= 288|access-date= 2018-08-04}} 7. ^{{cite |author= Russell K. Lewis|title= Stratigraphy and depositional environments of the Late Cretaceous (Late Turonian) Codell sandstone and Juana Lopez members of the Carlile shale, southeast Colorado|series= 2013 - Mines Theses & Dissertations|url= https://dspace.library.colostate.edu/bitstream/handle/11124/13/Lewis_mines_0052N_10329.pdf|access-date= 2018-08-14}} 15 : Shale formations of the United States|Upper Cretaceous Series of North America|Cretaceous United States|Campanian Stage|Cenomanian Stage|Coniacian Stage|Santonian Stage|Turonian Stage|Cretaceous Arizona|Cretaceous Colorado|Cretaceous geology of New Mexico|Cretaceous geology of Texas|Cretaceous geology of Utah|Cretaceous geology of Wyoming|Geology of the Rocky Mountains |
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