imported>Volcanoguy: removed Category:Dolomite formations; added Category:Dolomite formations of Canada using HotCat

2025-06-21T20:04:05Z

removed Category:Dolomite formations; added Category:Dolomite formations of Canada using HotCat

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{{short description |Geologic formation in Western Canada}}
{{Infobox Rockunit
| name = Baldonnel Formation
| image =
| caption =
| type = [[Geological formation]]
| age = {{Fossil range|Carnian|Carnian|[[Carnian]]}}
| period = Carnian
| prilithology = [[Limestone]], [[Dolomite (rock)|dolomite]]
| otherlithology = [[Siltstone]], [[sandstone]]
| namedfor = [[Baldonnel, British Columbia]]
| namedby = L.M. Clark, 1957
| region = [[Alberta]], [[British Columbia]]
| country = Canada
| coordinates = {{coord|56.11404|-122.81095|name=Baldonnel Formation|display=inline,title}}
| unitof = [[Schooler Creek Group]]
| subunits = [[Ducette Member]]
| underlies = [[Pardonet Formation]], [[Fernie Formation]]
| overlies = [[Charlie Lake Formation]]
| thickness = up to {{convert|146|m|ft|-1}}<ref name=lexicon>{{Cite web |url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:000714 |archive-url=https://archive.today/20120709201501/http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:000714 |url-status=dead |archive-date=July 9, 2012|title=Baldonnel Formation |author=[[Lexicon of Canadian Geologic Units]] |accessdate=February 14, 2009 }}</ref>
| extent =
| area =
| map =
| map_caption =
}}
The '''Baldonnel Formation''' is a [[stratigraphic unit]] of [[Carnian]] [[Geochronology|age]] in the [[Western Canadian Sedimentary Basin]].

It takes the name from the hamlet of [[Baldonnel, British Columbia]], and was first described in the ''Pacific Fort St. John No. 16'' well by L.M. Clark in 1957.<ref>Clark, L.M., 1957. Fort St. John sets pace for Peace River gas fields. Oil and Gas Journal, v. SS, no. 33, p.132-134.</ref> A surface type locality can be found at Brown Hill, on the north shore of [[Williston Lake]], at {{coord|56.11404|-122.81095|name=Baldonnel Formation}}.

==Lithology==
The upper unit of the Baldonnel Formation consists of grey massive [[limestone]] and [[Dolomite (rock)|dolomite]] in the [[Canadian Rockies]] foothills and in the western range between the [[Liard River]] and [[Peace River (Canada)|Peace River]]. [[Siltstone]] and fine grained [[sandstone]] occur as interbeds.

In the sub-surface of the [[Peace River Country]], the Baldonnel Formation is represented by [[porosity|porous]] and [[Permeability (earth sciences)|permeable]] dolomite.

===Oil and gas production===
[[Natural gas|Gas]] is produced from the Baldonnel Formation in north-eastern [[British Columbia]].<ref>{{Cite journal|url=http://bcpg.geoscienceworld.org/cgi/content/abstract/52/4/277|title=Hydrocarbon source rock characterization and thermal maturity of the Upper Triassic Baldonnel and Pardonet formations, northeastern British Columbia, Canada |journal=Bulletin of Canadian Petroleum Geology| volume= 52|issue= 4 |pages=277–301| doi= 10.2113/52.4.277|date=December 2004|accessdate=February 14, 2009 |url-access=subscription |last1=Riediger |first1=C. }}</ref>

==Distribution==
The Baldonnel Formation occurs in [[outcrop]]s in the [[Williston Lake]] area of the [[Canadian Rockies]], and in the sub-surface from the [[Liard River]] to the [[Peace River Country]].

It reaches a maximum thickness of {{convert|146|m|ft|-1}} south of [[Hudson's Hope, British Columbia|Hudson's Hope]].

==Relationship to other units==
The Baldonnel Formation is the middle member of the [[Schooler Creek Group]]. It is conformably overlain by the [[Pardonet Formation]] limestone and siltstone or [[unconformity|unconformably]] overlain by the [[Fernie Formation]] shale. North of the [[Williston Lake]] it overlies the dolomite beds of the [[Charlie Lake Formation]].

It is equivalent to the upper parts of the [[McLearn Formation]] and [[Ludington Formation]]. It can also be correlated with the [[Winnifred Member]] of the [[Whitehorse Formation (Canada)|Whitehorse Formation]] in [[central Alberta]].

===Ducette Member===
The lower unit is designated as [[Ducette Member]].<ref name=Ducette>{{Cite web|url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:004228 |archive-url=https://archive.today/20130221080046/http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:004228 |url-status=dead |archive-date=2013-02-21 |title=Ducette Member |author=[[Lexicon of Canadian Geologic Units]] |accessdate=February 14, 2009}}</ref> It occurs only in the south-west of the range, between the [[Liard River]] and the [[Peace River (Canada)|Peace River]].

It is composed of argillaceous [[siltstone]], very fine grained [[sandstone]] and [[limestone]].

==References==
{{reflist}}

{{WCSB|Northwest_Plains=yes}}

{{clear}}

[[Category:Geologic formations of Alberta]]
[[Category:Geologic formations of British Columbia]]
[[Category:Triassic Alberta]]
[[Category:Triassic British Columbia]]
[[Category:Limestone formations of Canada]]
[[Category:Dolomite formations of Canada]]
[[Category:Siltstone formations of Canada]]
[[Category:Sandstone formations of Canada]]

Baldonnel Formation - Revision history

imported>Volcanoguy: removed Category:Dolomite formations; added Category:Dolomite formations of Canada using HotCat