imported>Volcanoguy: removed Category:Siltstone formations; added Category:Siltstone formations of the United States using HotCat

2025-06-04T21:55:24Z

removed Category:Siltstone formations; added Category:Siltstone formations of the United States using HotCat

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{{Short description|Geological formation}}
{{Infobox Rockunit
| name = Doig Formation
| image =
| caption =
| type = [[Geological formation]]
| age = [[Anisian|middle Anisian]]-[[Ladinian]]<br>~{{Fossil range|245|237}}
| period = Middle Triassic
| prilithology = [[Siltstone]], [[shale]]
| otherlithology = [[Phosphate]], [[sandstone]]
| namedfor = [[Doig River]]
| namedby = J.H. Armitage
| year_ts = 1962
| region = NW [[Alberta]]<br>NE [[British Columbia]]<br>SE [[Yukon]]
| country = [[Canada]]
| coordinates = {{coord|55.7|N|121.3|W|display=inline,title}}
| paleocoordinates = {{coord|25.1|N|35.0|E|display=inline}}
| unitof =
| subunits =
| underlies = [[Halfway Formation]]
| overlies = [[Montney Formation]]
| thickness = up to {{convert|190|m|ft|-1}}<ref name=lexicon/>
| extent = [[Western Canadian Sedimentary Basin]]
| area =
| map = {{Location map+ | Canada#British Columbia
| relief = 1
| width = 250
| float = center
| places =
{{Location map~ | Canada#British Columbia
| lat_deg = 55.7
| lon_deg = -121.3
| mark = Pink ff0080 pog.svg
| marksize = 12
}}
}}
| map_caption =
}}

The '''Doig Formation''' is a [[Formation (geology)|geologic formation]] of [[middle Triassic]] [[Geochronology|age]] in the [[Western Canadian Sedimentary Basin]]. It takes the name from [[Doig River]], a tributary of the [[Beatton River]], and was first described in the Texaco N.F.A. Buick Creek No. 7 well (located north-west of [[Fort St. John, British Columbia|Fort St. John]], east of the [[Alaska Highway]]) by J.H. Armitage in 1962. .<ref>Armitage, J.H., 1962. Triassic oil and gas occurrences in northeastern British Columbia, Canada. J. Alberta Society of Petroleum Geologists, v. 10, p. 35-36.</ref>

== Lithology ==
The Doig Formation is composed of fine grained, grey [[Argillaceous minerals|argillaceous]] [[siltstone]] and dark calcareous [[shale]].
<ref name=lexicon>
{{Cite web
|url = http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:004083
|title = Doig Formation
|author = [[Lexicon of Canadian Geologic Units]]
|accessdate = 2009-03-21
|url-status = dead
|archiveurl = https://archive.today/20130221084810/http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:004083
|archivedate = 2013-02-21
}}
</ref>
[[Phosphate]] nodules occur at the base of the formation. Anomalously thicker, [[Porosity|porous]] [[sandstone]] channels and bars are present locally in the upper units of the formation.<ref>{{cite journal|last1=Glass|first1=D|title=Lexicon of Canadian Stratigraphy|date=1997|volume=4|issue=Western Canada, Including Eastern British Columbia, Alberta, Saskatchewan and Southern Alberta}}</ref> The formation has provided fossils of various species of [[conodont]]s; ''[[Magnigondolella|Magnigondolella alexanderi]]'', ''[[Magnigondolella|M. cyri]]'', ''[[Magnigondolella'|M. julii]]'', ''[[Magnigondolella|M. nebuchadnezzari]]'', ''[[Magnigondolella|M. salomae]]'', ''[[Neogondolella curva]]'',
''[[Neogondolella|N. hastata]]'', ''[[Neogondolella|N. panlaurentia]]'' and ''[[Neogondolella|N. ex gr. shoshonensis]]''.<ref name=Golding2018>{{cite journal |last1=Golding |first1=M. L. |first2=M. J. |last2=Orchard |year=2018 |title=''Magnigondolella'', a new conodont genus from the Triassic of North America |journal=Journal of Paleontology |volume=92 |issue=2 |pages=207–220|doi=10.1017/jpa.2017.123 |bibcode=2018JPal...92..207G |s2cid=133681181 }}</ref>

== Distribution ==
The Doig Formation reaches a maximum thickness of {{convert|190|m|ft|-1}} in the [[Canadian Rockies]] foothills it thins towards the north and east. It occurs in the subsurface in north-western [[Alberta]], north-eastern [[British Columbia]] and southern [[Yukon]], from 53°N and 118°W to the Canadian Rockies.<ref name=lexicon/>

== Relationship to other units ==
The Doig Formation is [[unconformity|unconformably]] overlain by the [[Halfway Formation]] of the [[Schooler Creek Group]]; the contact is marked by a [[Dolomite (mineral)|dolomitic]] bed and a [[chert]] and [[quartz]] [[Conglomerate (geology)|conglomerate]] bed.<ref>{{Cite web|url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:006138 |archive-url=https://archive.today/20120715034615/http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:006138 |url-status=dead |archive-date=2012-07-15 |title=Halfway Formation |author=[[Lexicon of Canadian Geologic Units]] |accessdate=2009-03-21 }}</ref> To the west it is overlain by younger Jurassic beds. It conformably overlies the [[Montney Formation]] and the contact is marked by a [[phosphate]] pellet bed in the base of the Doig.<ref name=lexicon/>

The formation correlates with the lower Llama Member of the [[Sulphur Mountain Formation]] in the southern ranges of the [[Canadian Rockies]], with the Whistler Member of the [[Whitehorse Formation (Canada)|Whitehorse Formation]] in the [[Muskwa Ranges]], and with the [[Toad Formation]] in the upper [[Liard River]] area.<ref name=lexicon/>

== Petroleum geology ==
The Doig formation is an important [[source rock]] for the Triassic [[Halfway Formation|Halfway]] and [[Charlie Lake Formation|Charlie Lake]] formations.<ref>{{cite journal|last1=Riediger|first1=C.L.|title=Lower and Middle Triassic source rocks, thermal maturation, and oil-source rock correlations in the Peace River Embayment area, Alberta and British Columbia|journal=Bulletin of Canadian Petroleum Geology|date=December 1990|volume=38 A|pages=218–235|url=http://archives.datapages.com/data/cspg/data/038a/038a001/0218.htm}}</ref> [[Total organic carbon]] values in the "phosphate zone" at the base of the Doig are commonly greater than 4% by weight and can reach up to 11%. The "phosphate zone" is also a potential undeveloped [[shale gas]] reservoir with as much as 400 trillion cubic feet of [[natural gas]] in place.<ref>{{cite journal|last1=Walsh|first1=Warren|title=Regional "Shale Gas" Potential of the Triassic Doig and Montney Formations Northeastern British Columbia|journal=British Columbia Geoscience Petroleum Geology Open File 2006-02|date=2006|url=http://www2.gov.bc.ca/gov/DownloadAsset?assetId=789339983AF04FA8A5E26162448B41F0}}</ref> Oil and gas is also extracted from the Doig Formation in conventional reservoirs along the western [[Montney Formation|Montney trend]] and in the [[Peace River Country|Peace River Arch]].

== References ==
{{reflist}}

{{Western Canadian Sedimentary Basin|Northwest_Plains=yes}}

[[Category:Triassic System of North America]]
[[Category:Triassic Alberta]]
[[Category:Triassic British Columbia]]
[[Category:Triassic Yukon]]
[[Category:Anisian Stage]]
[[Category:Ladinian Stage]]
[[Category:Siltstone formations of the United States]]
[[Category:Shale formations of Canada]]
[[Category:Source rock formations]]
[[Category:Reservoir rock formations]]
[[Category:Geologic formations of Alberta]]
[[Category:Geologic formations of British Columbia]]
[[Category:Geologic formations of Yukon]]

Doig Formation - Revision history

imported>Volcanoguy: removed Category:Siltstone formations; added Category:Siltstone formations of the United States using HotCat