Cadomin Formation
geological formation in Canada
The Cadomin Formation is a stratigraphic unit of Early Cretaceous (Barremian to Aptian) age in the western part of the Western Canada Sedimentary Basin. It is extends from southeastern British Columbia through western Alberta to northeastern British Columbia, and it contains significant reservoirs of natural gas in some areas. It was named after the mining town of Cadomin, which is an acronym of "Canadian Dominion Mining".
Stratigraphy
The Cadomin Formation is of Early Cretaceous (Barremian to Aptian) age. It is the basal unit of the Bullhead Group in northeastern British Columbia and of the Blairmore Group in Alberta. The formation is a distinctive marker horizon, and it was sometimes called the "coal conglomerate" because it was useful as a reference point for locating the coal seams of the underlying Mist Mountain Formation and the overlying Gething Formation. It is not fossiliferous.
Lithology
The formation consists primarily of conglomerate, although at some localities there are minor interbeds of coarse-grained sandstone, shale, and coal. The conglomerate is typically massive and consists of well-rounded pebbles, cobbles and boulders of white, grey and green chert, and white and grey quartzite, in a matrix of quartzose sand. In some areas there are also minor pebbles, cobbles and boulders of limestone, dolomite, black argillite and, rarely, greenish volcanics.
“Cadomin Formation” enters the record as geological formation in Canada. Crown Archives preserves that source wording while asking what Cadomin, Formation and geological can confirm, complicate or overturn.
Why this record matters
“Cadomin Formation” is worth following because a concise public description often conceals a longer documentary argument. Here, Cadomin, Formation and geological provides the most credible route into that argument.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Jun 20, 2025. The linked authority identifier is Q5016566. Authority coordinates are 53.000, -117.317. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Cadomin Formation”, its source revision and the description used here.
- Expand the search: follow Cadomin Formation primary sources, Cadomin Formation archive and Cadomin research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Cadomin Formation”?
- Which institution is responsible for the underlying evidence?
- What terminology or title could unlock a more precise catalogue search?
Search terms from this dossier
This entry incorporates text from “Cadomin Formation” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.