Stoddart Group

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

Stoddart Group Stratigraphic range: Mississippian to Pennsylvanian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Sub-units	Taylor Flat Formation Kiskatinaw Formation Golata Formation
Underlies	Ishbel Group, Prophet Formation
Overlies	Debolt Formation
Thickness	up to 660 metres (2,170 ft)[1]
Lithology
Primary	Limestone, Sandstone, Shale
Other	dolomite, siltstone, coal, anhydrite
Location
Coordinates	56.219°N 120.800°W / 56.219; -120.800 (Stoddart Group)
Region	Alberta
Country	Canada
Type section
Named for	Stoddart Creek
Named by	A.T.C. Rutgers, 1958.

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 Mattson Formation and the Mount Head Formation of the southern Canadian Rockies, and with the Amsden Formation in Montana.

References

1. 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.