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{{Infobox Rockunit
| name = Banff Formation
| image = MountRundle.jpg
| caption = The Banff Formation is visible on the eastern (left) slope of [[Mount Rundle]].
| type = [[Geological formation]]
| age = {{Fossil range|Famennian|Tournaisian}}
| period = Paleozoic
| prilithology = [[Shale]], [[limestone]]
| otherlithology = [[Chert]], [[sandstone]], [[siltstone]]
| namedfor = [[Banff, Alberta]]
| namedby = E.M. Kindle, 1924
| region = [[Alberta]], [[British Columbia]]
| country = [[Canada]]
| coordinates = {{coord|51|09|54|N|115|31|08|W|name=Banff Formation}}
| unitof =
| subunits = Members A to F
| underlies = [[Pekisko Formation]], [[Livingstone Formation]]
| overlies = [[Palliser Formation]], [[Wabamun Formation]], [[Exshaw Formation]]
| thickness = up to {{convert|400|m|ft|-1}}<ref name=lexicon>{{Cite web|url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:000747|archive-url=https://archive.today/20130221161847/http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:000747|url-status=dead|archive-date=2013-02-21|title=Banff Formation|author=[[Lexicon of Canadian Geologic Units]]|access-date=2009-02-10}}</ref>
| extent =
| area =
| map =
| map_caption =
}}
The '''Banff Formation''' is a [[stratigraphic unit]] of [[Devonian]] [[Geochronology|age]] in the [[Western Canadian Sedimentary Basin]].

It takes the name from the town of [[Banff, Alberta]], and was first described on the north-west slope of [[Mount Rundle]], near Banff by E.M. Kindle in 1924.<ref>Kindle, E.M., 1924b. Standard Paleozoic section of Rocky Mountains near Banff, Alberta; Pan-American Geologist, vol. 42, no. 2 (September), pp. 113-124.</ref>

==Lithology==
The Banff Formation is composed of [[shale]] and [[marlstone]] in the base, [[chert]] and [[limestone]] in the middle, [[sandstone]], [[siltstone]] and [[shale]] at the top.

==Distribution==
The Banff Formation extends from the [[49th parallel north|49th parallel]] in southern [[Alberta]] and the [[Kootenays]] region of [[British Columbia]] to north-eastern British Columbia, [[northern Alberta]] and the [[District of Mackenzie]] in the [[Northwest Territories]]. In its southern area, the thickness ranges from {{convert|400|ft|m|-1}} in the [[Rocky Mountains]] to {{convert|150|ft|m|-1}} in the sub-surface of the prairies. In the north, it ranges from {{convert|450|ft|m|-1}} in the [[Peace River Country]] to {{convert|450|ft|m|-1}} in northern Alberta.

The age of the formation ranges from late [[Famennian]] to [[Tournaisian]].

==Relationship to other units==
The Banff Formation is overlies the [[Palliser Formation]] in the [[Canadian Rockies]], the [[Wabamun Formation]] in [[central Alberta]], the [[Exshaw Formation]] in [[southern Alberta]] and in the [[Fort Nelson, British Columbia|Fort Nelson]] area. It is overlain by the [[Pekisko Formation]] and the [[Livingstone Formation]] in north-central and southern Alberta respectively, and it is followed by the [[Shunda Formation]] in north-eastern British Columbia. An [[unconformity]] is observed between Banff and the [[Rundle Group]] in [[outcrop]].

The Banff Formation is equivalent to the [[Lodgepole Formation]] in [[Montana]]. It can be correlated with the [[Besa River Formation]] in north-eastern British Columbia. In the southeastern [[Rocky Mountains]], part of the formation passes laterally into the [[Pekisko Formation]].

==References==
{{Reflist}}
{{Western Canadian Sedimentary Basin|Northwest_Plains=yes|Northeast_Plains=yes|South AB=yes}}
{{Authority control}}

[[Category:Geologic formations of Alberta]]
[[Category:Geologic formations of British Columbia]]
[[Category:Devonian Alberta]]
[[Category:Devonian British Columbia]]
[[Category:Western Canadian Sedimentary Basin]]
[[Category:Carboniferous southern paleotropical deposits]]
[[Category:Shale formations of Canada]]
[[Category:Limestone formations of Canada]]
[[Category:Sandstone formations of Canada]]
[[Category:Siltstone formations of Canada]]
[[Category:Chert formations]]

Banff Formation - Revision history

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