Smoky Group

Smoky Group
Smoky Group
Stratigraphic range: Late Cretaceous

Kaskapau Shale exposed along the Pouce Coupe River
Type Geological formation
Sub-units Puskwaskau Formation
Bad Heart Formation
Kaskapau Formation
Underlies Wapiti Group
Overlies Dunvegan Formation
Thickness up to 1,100 feet (340 m)[1]
Lithology
Primary Shale, sandstone, siltstone
Location
Named for Smoky River
Named by George Mercer Dawson, 1881.
Region  Alberta,  British Columbia
Country  Canada

The Smoky Group is a stratigraphical unit of Late Cretaceous age in the Western Canadian Sedimentary Basin.

It takes the name from the Smoky River, and was first described in outcrops along the banks of the Smoky River, Spirit River and Pouce Coupe Rivers by George Mercer Dawson in 1881.[2].

Contents

Lithology

The Smoky Group is represented by marine silty shale with ironstone and bentonite streaks. Sandstone occurs at the base, and is transitional to the Dunvegan Formation.[1]

Hydrocarbon production

Gas is produced from the Cardium Formation in the southern reaches of the Group, in central Alberta and northern Alberta.

Distribution

The Kaskapau Shale reaches 477m in the Pouce Coupe River area and thins towards the east in the Smoky River area. The Bad Heart Formation sandstone is up to 8m thick, while the Puskwaskau Formation ranges from 200m in the Pouce Coupe Prairie to 123m in the Spirit River area. The entire group measures up to 677 m (2,220 ft) in the Pouce Coupe Prairie, and can reach 1,100 m (3,610 ft) in the Canadian Rockies foothills of northeast British Columbia.[1]

Relationship to other units

The Smoky Group is conformably and transgressively followed by the Wapiti Group and rests conformably on the Dunvegan Formation sandstone. The Cardium sandstone and Muskiki shale are replacing the upper parts of the Kaskapau Formation in the south-east of the distribution area. The entire group correlates with the Blackstone Formation, Cardium Formation and Wapiabi Formation of the Alberta Group in the southern foothills. The equivalent stratigraphic sequence in central Alberta consists of the Lea Park Formation and the upper Colorado Group, in north-eastern Alberta it correlates with Labiche Formation, and with the Kotaneelee Formation in the Liard River area.[1]

Subdivisions

The Smoky Group has the following sub-divisions from top to bottom:

Sub-unit Age Lithology Max.
Thickness
Reference
Puskwaskau Formation Santonian dark marine shale, siltstone beds 200 m (660 ft) [3]
Bad Heart Formation Coniacian medium to coarse grained marine sandstone 8 m (30 ft) [4]
Kaskapau Formation Turonian to Coniacian dark, fissile shale 900 m (2,950 ft) [5]
Basal sandstone tongues
Howard Creek Member late Cenomanian fine to medium grained glauconitic sandstone 4 m (10 ft) [6]
Doe Creek Member Cenomanian fine grained sandstone 25 m (80 ft) [7]
Pouce Coupe Member Cenomanian massive, fine grained sandstone 9 m (30 ft) [8]

The Kaskapau Formation is equivalent to the sum of Blackstone Formation, Cardium Formation and Muskiki Formation.[5]

References

  1. ^ a b c d Lexicon of Canadian Geologic Units. "Smoky Group". http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:013975. Retrieved 2009-02-11. 
  2. ^ Dawson, G.M., 1881. Report on the exploration from Port Simpson on the Pacific Coast to Edmonton on the North Saskatchewan River, Embracing a portion of the northern part of British Columbia and the Peace River Country, with Maps 150 and 152; Geological Survey of Canada, Report of Progress 1879-1880, Part B, p. 1-77.
  3. ^ Lexicon of Canadian Geologic Units. "Puskwaskau Formation". http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:012285. Retrieved 2009-02-11. 
  4. ^ Lexicon of Canadian Geologic Units. "Bad Heart Formation". http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:000656. Retrieved 2009-02-11. 
  5. ^ a b Lexicon of Canadian Geologic Units. "Kaskapau Formation". http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:007398. Retrieved 2009-02-11. 
  6. ^ Lexicon of Canadian Geologic Units. "Howard Creek Member". http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:006740. Retrieved 2009-02-11. 
  7. ^ Lexicon of Canadian Geologic Units. "Doe Creek Member". http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:004066. Retrieved 2009-02-11. 
  8. ^ Lexicon of Canadian Geologic Units. "Pouce Coupe Member". http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:012150. Retrieved 2009-02-11. 

Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Smoky Hollow (neighborhood) — Smoky Hollow (also known as The Hollow) is a neighborhood in Youngstown, Ohio. Located northeast of Youngstown s downtown, Smoky Hollow is now part of the campus of Youngstown State University. The district has long been in a state of decline,… …   Wikipedia

  • Smoky White-toothed Shrew — Conservation status Vulnerable (IUCN 3.1) Scientific classification …   Wikipedia

  • Smoky Dawson — MBE (19 March 1913 ndash; 13 February 2008) was an Australian country music performer. He was widely touted as Australia s first singing cowboy.Born Herbert Henry Dawson in Collingwood, Victoria and raised in the rural area of Warrnambool, his… …   Wikipedia

  • Smoky Valley Roller Mill — U.S. National Register of Historic Places …   Wikipedia

  • Smoky Hill High School — Infobox School name =Smoky Hill High School size =200px motto = established = 1974 type =Public affiliation = district =Cherry Creek School District grades =9 12 president = principal =Mr. Randy Karr head of school = dean = faculty = staff =141… …   Wikipedia

  • Smoky Shrew — Taxobox name = Smoky ShrewMSW3 Hutterer | pages = 288] status = LR/lc status system = iucn2.3 status ref = IUCN2006|assessors=Insectivore Specialist Group|year=1996|id=41396|title=Sorex fumeus|downloaded=12 May 2006 Database entry includes… …   Wikipedia

  • Smoky Black — Als Genetik der Pferdefarben werden die Auswirkungen der genetischen Faktoren auf die Farbgebung von Pferden bezeichnet. Für jede Farbvariante werden dabei die Farbe des Deckhaars, des Langhaars, der Augen und der Haut betrachtet.… …   Deutsch Wikipedia

  • Colorado Group — Stratigraphic range: middle Albian to Santonian …   Wikipedia

  • Alberta Group — Stratigraphic range: Albian to Campanian …   Wikipedia

  • Hiking in the Great Smoky Mountains National Park — The Great Smoky Mountains National Park is a United States National Park located in a region of the Appalachian Mountains referred to as the Great Smoky Mountains, in a portion of east central Tennessee and southeast North Carolina. With over 150 …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”