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词条 Schooler Creek Group
释义

  1. Lithology

  2. Distribution

  3. Relationship to other units

     Subdivisions 

  4. References

{{Infobox Rockunit
| name = Schooler Creek Group
| image =
| caption =
| type = Geological formation
| age = Ladinian to Norian {{Fossil range|235|203| }}
| period = Norian
| prilithology = Limestone, dolostone
| otherlithology = Siltstone, shale, evaporite minerals
| namedfor =
| namedby = F.H. McLearn, 1921
| region = {{flag|British Columbia}}
| country = {{flag|Canada}}
| coordinates = {{coord|56.2769|N|120.9836|W|name=Pacific Fort St. John No. 16|display=inline,title}}
| unitof =
| subunits = Bocock Formation, Pardonet Formation, Baldonnel Formation, Ludington Formation, Charlie Lake Formation, Halfway Formation
| underlies = Fernie, Bullhead, Fort St. John Group
| overlies = Toad Formation, Doig Formation
| thickness = up to {{convert|730|ft|m|-1}}[1]
| extent =
| area =
| map =
| map_caption =
}}

The Schooler Creek Group is a stratigraphic unit of Middle to Late Triassic (Ladinian to Norian) age in the Western Canadian Sedimentary Basin. It is present in northeastern British Columbia. It was named for Schooler Creek, a left tributary of Williston Lake, and was first described in two oil wells (Pacific Fort St. John No. 16 and Southern Production No. B-14-1) northwest of Fort St. John, by F.H. McLearn in 1921.[2] Exposures along Williston Lake serve as a type locality in outcrop.

Lithology

The Schooler Creek Group is composed of limestone and dolostone, with subordinate siltstone, shale, sandstone, and evaporite minerals such as gypsum and anhydrite.

Distribution

The Schooler Creek Group outcrops in the foothills of the northern Canadian Rockies in northeastern British Columbia, where it reaches its maximum thickness of {{convert|730|ft|m|-1}}. In the subsurface, it extends throughout the plains of the Peace River Country. The Pardonet Formation has its type locality at Pardonet Hill, on the south shore of the Williston Lake at {{coord|56.05328|-123.01889|name=Pardonel Hill}}.

Relationship to other units

The Schooler Creek Group is unconformably overlain by the Fernie shale, or by the Bullhead or Fort St. John Group. It conformably overlies the Toad Formation or the Doig Formation.

Subdivisions

The Schooler Creek Group has the following sub-divisions from top to base:

Sub-unit Age Lithology Thickness Reference
Bocock Formation late Norian aphanitic crystalline and bioclastic limestone 63|m|ft|-1}}[3]
Pardonet Formation Norian limestone, silty limestone, siltstone, rare shale 137|m|ft|-1}}[4]
Baldonnel Formation Carnian limestone, dolostone, with interbeds of siltstone and very fine grained sandstone 146|m|ft|-1}}[5]
Ludington Formation Carnian dolomitic and calcareous siltstone, sandstone, bioclastic limestone 500|m|ft|-1}}[6]
Charlie Lake Formation Carnian aeolian sandstones, limestone, dolomite and evaporite minerals such as anhydrite. Deposited in a series of sand dunes and sabkah environments similar to the modern Coastal Ergs of Namibia. 550|m|ft|-1}}[7][8][9][10]
Halfway Formation early Ladinian to Carnian sandstone, with interbeds of siltstone, dolostone and limestone 416|m|ft|-1}}[11]

References

1. ^{{Cite web|url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:013387 |title=Schooler Creek Group|author=Lexicon of Canadian Geologic Units |accessdate=2009-02-10}}
2. ^McLearn, F.H., 1921. Mesozoic of upper Peace River, British Columbia Geological Survey of Canada, Summary Report 1920, Part B, p. 1-6.
3. ^{{Cite web|url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:001584 |title=Bocock Formation|author=Lexicon of Canadian Geologic Units |accessdate=2009-02-11}}
4. ^{{Cite web|url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:011512 |title=Pardonet Formation|author=Lexicon of Canadian Geologic Units |accessdate=2009-02-11}}
5. ^{{Cite web|url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:000714 |title=Baldonnel Formation|author=Lexicon of Canadian Geologic Units |accessdate=2009-02-11}}
6. ^{{Cite web|url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:008848 |title=Ludington Formation|author=Lexicon of Canadian Geologic Units |accessdate=2009-02-11}}
7. ^{{Cite web|url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:002775 |title=Charlie Lake Formation|author=Lexicon of Canadian Geologic Units |accessdate=2009-02-11}}
8. ^Higgs, R. "Sedimentology and Petroleum Geology of the Artex Member (Charlie Lake Formation), Northeast British Columbia [Abstract]." Bulletin of Canadian Petroleum Geology 38.1 (1990): 166-166.
9. ^Arnold, K.J. Origin and distribution of aeolian sandstones in the Triassic Charlie Lake Formation, northeastern British Columbia. 1996.
10. ^{{cite journal|last=Fefchak|first=Chelsea|title=Sedimentology of the Charlie Lake Formation|journal=MSc. Thesis, University of Alberta|date=Oct 2, 2011|url=http://hdl.handle.net/10402/era.27704}}
11. ^{{Cite web|url=http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:006138 |title=Halfway Formation|author=Lexicon of Canadian Geologic Units |accessdate=2009-02-11}}
{{WCSB|Northwest_Plains=yes}}

4 : Geologic formations of Canada|Western Canadian Sedimentary Basin|Stratigraphy of British Columbia|Triassic British Columbia
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