Stoddart Group

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Stoddart Group
Stratigraphic range: Mississippian to Pennsylvanian
TypeGeological formation
Sub-unitsTaylor Flat Formation
Kiskatinaw Formation
Golata Formation
UnderliesIshbel Group, Prophet Formation
OverliesDebolt Formation
Thicknessup to 660 metres (2,170 ft)[1]
Lithology
PrimaryLimestone, Sandstone, Shale
Otherdolomite, siltstone, coal, anhydrite
Location
Coordinates56°13′08″N 120°48′00″W / 56.219°N 120.800°W / 56.219; -120.800 (Stoddart Group)Coordinates: 56°13′08″N 120°48′00″W / 56.219°N 120.800°W / 56.219; -120.800 (Stoddart Group)
Region Alberta
Country Canada
Type section
Named forStoddart Creek
Named byA.T.C. Rutgers, 1958.

The Stoddart Group is a stratigraphical unit of Mississippian to Early Pennsylvanian age in the Western Canadian Sedimentary Basin.

It takes the name from the Stoddart Creek, a creek that flows into Charlie Lake north of Fort St. John, and was first described in well Pacific Fort St. John #23 (at depths from 2000 to 2600m) by A.T.C. Rutgers in 1958.

Lithology[]

The Formation is composed of both carbonate and clastic facies. [1]

Distribution[]

The Stoddart Group reaches a maximum thickness of 660 metres (2,170 ft) in the sub-surface north of Fort St. John in north-eastern British Columbia. It is present in the sub-surface from the foothills of the Northern Rockies and eastwards into the Peace River Country in north-western Alberta.[1]

Subdivisions[]

The Stoddart Group is composed of the following formations, from top to bottom:

Sub-unit Age Lithology Max.
Thickness		 Reference
Taylor Flat Formation Early Pennsylvanian limestone, dolomite, occasional sandstone, calcareous shale 152 m (500 ft) [2]
Kiskatinaw Formation Chesterian quartzose sandstone, dark grey shale, rare carbonate 183 m (600 ft) [3]
Golata Formation late Meramecian-Chesterian fossiliferous limestone, shales, occasional siltstone, coal and anhydrite 50 m (160 ft) [4]

Relationship to other units[]

The Stoddart Group is overlain by the Ishbel Group in the foothills and the Prophet Formation in the northern plains; it conformably overlays the Debolt Formation.[1]

It can be correlated with the Tunnel Mountain Formation, the Kananaskis Formation, the and the Mount Head Formation of the southern Canadian Rockies, and with the Amsden Formation in Montana.

References[]

  1. ^ a b c d Lexicon of Canadian Geologic Units. "Stoddart Group". Archived from the original on 2009-04-16. Retrieved 2009-03-01.
  2. ^ Lexicon of Canadian Geologic Units. "Taylor Flat Formation". Retrieved 2009-12-21.
  3. ^ Lexicon of Canadian Geologic Units. "Kiskatinaw Formation". Retrieved 2009-12-21.
  4. ^ Lexicon of Canadian Geologic Units. "Golata Formation". Archived from the original on 2009-04-16. Retrieved 2009-12-21.
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