Geological formation in Canada
Rundle Group The massive limestone beds form outcrops at the top of
Mount Rundle .
Type Geological formation Sub-units Debolt , Shunda , Pekisko , Mount Head , Livingstone , Turner Valley , Prophet Underlies Fernie Formation , Belloy Formation Overlies Banff Formation Thickness up to 741 m (2,430 ft)[ 1] Primary Limestone Other Chert Coordinates 51°09′N 115°30′W / 51.15°N 115.50°W / 51.15; -115.50 Region Alberta, British Columbia Country Canada Named for Mount Rundle Named by R.J.W. Douglas, 1953
The Rundle Group is a stratigraphic unit of Mississippian age in the Western Canadian Sedimentary Basin .
It takes the name from Mount Rundle (itself taking the name from Robert Terrill Rundle ), and was first described in outcrops at the northern side of the mountain in Banff National Park by R.J.W. Douglas in 1953.[ 2]
Lithology
The Rundle Group consists of massive limestone interbedded with dark argillaceous limestone. Chert nodules are observed in the shaley beds, and crinoids and brachiopods are observed in the clean massive beds.[ 1] Dolimitization is observed in the Elkton Member of the Turner Valley Formation .
Distribution
The Rundle Group reaches a maximum thickness of 741 feet (230 m) at Tunnel Mountain . It thins out toward east and north and is completely eroded or absent in east central and only the lower part occurs in southern Alberta .[ 1]
Relationship to other units
The Rundle Group is disconformably overlain by the Rocky Mountain Formation in the front ranges of the Canadian Rockies and by the Fernie Formation in the foothills and by Cretaceous beds in the prairies. It conformably overlies the Banff Formation .[ 1]
The Rundle Group can be correlated with the Mission Canyon Formation in southern Saskatchewan, northeastern Montana and North Dakota.
Subdivisions
The Rundle Group includes the Mount Head Formation and Livingstone Formation in the Rocky Mountains ; by the Turner Valley Formation , Shunda Formation and Pekisko Formation in the foothills and plains. It is equivalent to the Debolt Formation and Prophet Formation in north-eastern British Columbia and west-northern Alberta .[ 1] Debolt , Shunda and Pekisko formations are staked in the Fort Nelson area.
Sub-unit Age Lithology
Max.
Reference
Mount Head Formation Visean Wileman Member - silty dolomite Baril Member - ooid grainstone , dolomiteSalter Member - dolomite , boundstone and wackestone , ooid grainstone , anhydrite chert Loomis Member - massive grainstone Marston Member - microcrystalline dolomite, boundstone , breccia , ooid limestone, shale , marlstone Opal Member - grainstone , subordinate marlstone , chert packstone and wackestone , shale , marlstone , breccia Carnarvon Member - wackestone to packstone , shale interbeds7.6 m (20 ft)
[ 3]
Livingstone Formation Tournaisian to Visean crinoidal limestone , massive limestone, thin argillaceous limestone beds, dolomite452 m (1,480 ft)
[ 4]
Deep basin
References
^ a b c d e Lexicon of Canadian Geologic Units . "Rundle Group" . Archived from the original on February 22, 2013. Retrieved February 12, 2009 .^ Douglas, R.J.W., 1953b. Carboniferous stratigraphy in the southern Foothills of Alberta; Alberta Soc. Petrol. Geol., 3rd Ann. Field Conf. Guidebook, p. 66–88.
^ Lexicon of Canadian Geologic Units . "Mount Head Formation" . Retrieved February 12, 2009 .^ Lexicon of Canadian Geologic Units . "Livingstone Formation" . Archived from the original on July 7, 2012. Retrieved February 12, 2009 .^ Lexicon of Canadian Geologic Units . "Turner Valley Formation" . Retrieved February 12, 2009 .^ Lexicon of Canadian Geologic Units . "Shunda Formation" . Retrieved February 12, 2009 .^ Lexicon of Canadian Geologic Units . "Pekisko Formation" . Retrieved February 12, 2009 .^ Lexicon of Canadian Geologic Units . "Debolt Formation" . Archived from the original on July 11, 2012. Retrieved February 12, 2009 .^ Lexicon of Canadian Geologic Units . "Prophet Formation" . Retrieved February 12, 2009 .
