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{{Short description|Geological formation in Canada}}
{{Use mdy dates|date=June 2025}}
{{Infobox Rockunit
| name = Rundle Group
| image = MountRundle.jpg
| caption = The massive limestone beds form outcrops at the top of [[Mount Rundle]].
| type = [[Geological formation]]
| age = {{Fossil range|Middle Mississippian|Late Mississippian|Middle to Late [[Mississippian age|Mississippian]]}}
| period = Mississippian
| prilithology = [[Limestone]]
| otherlithology = [[Chert]]
| namedfor = [[Mount Rundle]]
| namedby = R.J.W. Douglas, 1953
| region = Alberta, British Columbia
| country = Canada
| coordinates = {{coord|51.15|N|115.50|W|display=inline,title}}
| unitof =
| subunits = [[Debolt Formation|Debolt]], [[Shunda Formation|Shunda]], [[Pekisko Formation|Pekisko]], [[Mount Head Formation|Mount Head]], [[Livingstone Formation|Livingstone]], [[Turner Valley Formation|Turner Valley]], [[Prophet Formation|Prophet]]
| underlies = [[Fernie Formation]], [[Belloy Formation]]
| overlies = [[Banff Formation]]
| thickness = up to {{cvt|741|m|ft|-1}}<ref name=lexicon>{{Cite web |url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:013065 |title=Rundle Group |author=[[Lexicon of Canadian Geologic Units]] |access-date=February 12, 2009 |archive-date=February 22, 2013 |archive-url=https://archive.today/20130222015657/http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:013065 |url-status=dead }}</ref>
| extent =
| area =
| map =
| map_caption =
}}
The '''Rundle Group''' is a [[stratigraphic unit]] of [[Mississippian age|Mississippian]] [[Geochronology|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.<ref>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.</ref>

==Lithology==
The Rundle Group consists of massive [[limestone]] interbedded with dark argillaceous limestone. [[Chert]] nodules are observed in the shaley beds, and [[crinoid]]s and [[brachiopod]]s are observed in the clean massive beds.<ref name=lexicon/> [[Dolimitization]] is observed in the [[Elkton Member]] of the [[Turner Valley Formation]].

==Distribution==
The Rundle Group reaches a maximum thickness of {{convert|741|ft|m|-1}} at [[Tunnel Mountain]]. It thins out toward east and north and is completely [[erosion|eroded]] or absent in east [[central Alberta|central]] and only the lower part occurs in [[southern Alberta]].<ref name=lexicon/>

==Relationship to other units==

The Rundle Group is [[unconformity|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]].<ref name=lexicon/>

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]].<ref name="lexicon" /> [[Debolt Formation|Debolt]], [[Shunda Formation|Shunda]] and [[Pekisko Formation]]s are staked in the [[Fort Nelson, British Columbia|Fort Nelson]] area.

====[[Canadian Rockies]]====
{|class="wikitable"
|-
! [[Geological unit|Sub-unit]] !! [[Geochronology|Age]] !! Lithology !! Max. Thickness !! Reference
|-
|[[Mount Head Formation]] || [[Visean]] ||[[Wileman Member]] - silty [[Dolomite (rock)|dolomite]] [[Baril Member]] - [[oolite|ooid]] [[grainstone]], dolomite [[Salter Member]] - [[Dolomite (rock)|dolomite]], [[boundstone (rock)|boundstone]] and [[wackestone]], ooid [[grainstone]], [[anhydrite]] [[chert]] [[Loomis Member]] - massive [[grainstone]] [[Marston Member]] - microcrystalline dolomite, [[boundstone (rock)|boundstone]], [[breccia]], ooid limestone, [[shale]], [[marlstone]] [[Opal Member]] - [[grainstone]], subordinate [[marlstone]], [[chert]] [[packstone]] and [[wackestone]], [[shale]], [[marlstone]], [[breccia]] [[Carnarvon Member]] - [[wackestone]] to [[packstone]], [[shale]] interbeds|| {{cvt|7.6|m|ft|-1}} {{cvt|39|m|ft|-1}} {{cvt|67|m|ft|-1}} {{cvt|101|m|ft|-1}} {{cvt|68|m|ft|-1}} {{cvt|161|m|ft|-1}} {{cvt|90|m|ft|-1}}
|<ref>{{Cite web |url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:010227 |title=Mount Head Formation |author=[[Lexicon of Canadian Geologic Units]] |access-date=February 12, 2009 }}</ref>
|-
|[[Livingstone Formation]] || [[Tournaisian]] to [[Visean]] || [[crinoid]]al [[limestone]], massive limestone, thin argillaceous limestone beds, dolomite || {{cvt|452|m|ft|-1}}
|<ref>{{Cite web |url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:008601 |title=Livingstone Formation |author=[[Lexicon of Canadian Geologic Units]] |access-date=February 12, 2009 |archive-date=July 7, 2012 |archive-url=https://archive.today/20120707092317/http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:008601 |url-status=dead }}</ref>
|-
|}

====Foothills and plains====
{|class="wikitable"
|-
! [[Geological unit|Sub-unit]] !! [[Geochronology|Age]] !! Lithology !! Max. Thickness !! Reference
|-
| [[Turner Valley Formation]] || [[Visean]] || [[crinoid]]al [[limestone]] and crystalline dolomite; two porous intervals are separated by a middle tight unit; [[diagenesis|diagenetically]] dolomitized in west [[southern Alberta]]; Lower porous zone is defined as [[Elkton Member]] || {{cvt|110|m|ft|-1}}
|<ref>{{Cite web |url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:015517 |title=Turner Valley Formation |author=[[Lexicon of Canadian Geologic Units]] |access-date=February 12, 2009 }}</ref>
|-
| [[Shunda Formation]] || [[Tournaisian]] to [[Visean]] || [[shale|argillaceous]] [[limestone]] and dolomite, [[siltstone]], [[sandstone]], [[shale]], [[breccia]], [[anhydrite]] || {{cvt|122 |m|ft|-1}}
|<ref>{{Cite web |url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:013726 |title=Shunda Formation |author=[[Lexicon of Canadian Geologic Units]] |access-date=February 12, 2009 }}</ref>
|-
| [[Pekisko Formation]] || [[Tournaisian]] || Upper Pekisko - lithographic limestone Lower Pekisko - massive [[crinoid]]al [[limestone]] || {{cvt|134|m|ft|-1}}
|<ref>{{Cite web |url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:011645 |title=Pekisko Formation |author=[[Lexicon of Canadian Geologic Units]] |access-date=February 12, 2009 }}</ref>
|-
|}

====Deep basin====
{|class="wikitable"
|-
! [[Geological unit|Sub-unit]] !! [[Geochronology|Age]] !! Lithology !! Max. Thickness !! Reference
|-
| [[Debolt Formation]] || [[Meramecian]] || Upper Debolt - crystalline dolomite, [[anhydrite]], [[micrite|micritic]] [[limestone]] Lower Debolt - [[chert|cherty]] bioclastic ([[crinoid]]al) [[limestone]], [[shale|argillaceous]] in the north || {{cvt|366|m|ft|-1}}
|<ref>{{Cite web |url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:003842 |title=Debolt Formation |author=[[Lexicon of Canadian Geologic Units]] |access-date=February 12, 2009 |archive-date=July 11, 2012 |archive-url=https://archive.today/20120711082741/http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:003842 |url-status=dead }}</ref>
|-
| [[Prophet Formation]] || middle [[Tournaisian]] to late [[Visean]] || [[chert]], skeletal to [[oolite|ooid]] [[limestone]], [[shale]], [[marlstone]], dolomite || {{cvt|760|m|ft|-1}}
|<ref>{{Cite web |url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:012238 |title=Prophet Formation |author=[[Lexicon of Canadian Geologic Units]] |access-date=February 12, 2009 }}</ref>
|-
|}

==References==
{{reflist}}
{{WCSB|Northwest_Plains=yes|South AB=yes|Canadian Rockies=yes}}

[[Category:Geologic groups of Alberta]]
[[Category:Geologic groups of British Columbia]]
[[Category:Carboniferous Alberta]]
[[Category:Carboniferous British Columbia]]
[[Category:Limestone groups of Canada]]
[[Category:Chert groups]]

Rundle Group - Revision history

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