Belloy Formation

{{Short description|Stratigraphical unit of Permian age in Canada}} {{Infobox Rockunit | name = Belloy Formation | image = | caption = | type = Geological formation | age = {{Fossil range|Permian|Permian|Permian}} | period = Permian | prilithology = Chert | otherlithology = Sandstone, siltstone, conglomerate, dolomite | namedfor = Belloy, Alberta | namedby = H.L. Halbertsma, 1959 | region = Alberta, British Columbia | country = Canada | coordinates = {{coord|55.7604|N|118.0487|W|name=Imperial Belloy 12-14-78-1W6M|display=inline,title}} | unitof = | subunits = | underlies = Montney Formation, Fort St. John Group | overlies = Rundle Group, Stoddart Group | thickness = up to {{convert|274|m|ft|-1}}<ref name=lexicon>{{Cite web|url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:001143|archive-url=https://archive.today/20120708060843/http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:001143|url-status=dead|archive-date=2012-07-08|title=Belloy Formation|author=Lexicon of Canadian Geologic Units|accessdate=2009-02-12}}</ref> | extent = | area = | map = | map_caption = }} The '''Belloy Formation''' is a stratigraphic unit of Permian age in the Western Canadian Sedimentary Basin.

It takes the name from the hamlet of Belloy, Alberta, and was first described in the Imperial Belloy 12-14-78-1W6M well by H.L. Halbertsma in 1959.<ref>Halbertsma, Henk Leendert, 1959. Nomenclature of Upper Carboniferous and Permian strata in the subsurface of the Peace River area; Canadian Society of Petroleum Geologists, Journal of the Alberta Society of Petroleum Geologists, vol. 7, no. 5 (May), pp.109-118.</ref>

==Lithology and depositional setting== The Belloy Formation is composed of mixed carbonate-siliciclastic sequences of cherty dolomite and sandstone, glauconitic and quartz sandstones, phosphorite, siltstones and conglomerate with phosphatic chert pebbles. The Belloy was deposited along a northwest-trending, tidally-influenced, west-prograding shoreline.<ref>{{cite journal|last1=Naqvi|first1=I.H.|title=The Belloy Formation (Permian), Peace River Area, Northern Alberta and Northeastern British Columbia|journal=Bulletin of Canadian Petroleum Geology|date=1972|volume=20|issue=1|url=http://archives.datapages.com/data/cspg/data/020/020001/0058.htm?q=%2BtextStrip%3Abelloy+%2BtextStrip%3Aage}}</ref>

==Distribution== The Belloy Formation reaches a maximum thickness of {{convert|274|m|ft|-1}} in the Canadian Rockies foothills south of Fort St. John. It thins out towards the east and occurs in the sub-surface throughout the Peace River Country.

==Relationship to other units== The Belloy Formation is disconformably overlain by Triassic or younger beds (Montney Formation, Fort St. John Group). It is unconformably overlies Mississippian sediments such as those of the Rundle Group.

The Belloy Formation is homotaxial with the Belcourt Formation and Kindle Formation of the Rocky Mountains.

==References== {{Reflist}} {{WCSB|Northwest_Plains=yes|Fort_Nelson=yes}}

Category:Geologic formations of Alberta Category:Geologic formations of British Columbia Category:Permian northern paleotemperate deposits Category:Permian Alberta Category:Permian British Columbia Category:Sandstone formations of Canada Category:Siltstone formations of Canada Category:Conglomerate formations of Canada Category:Dolomite formations of Canada Category:Chert formations