Unit Name: Taylorton Member
Unit Type: Lithostratigraphic
Rank: Member
Status: Formal
Usage: Currently in use
Age Interval: Ludlow ? (422.9 - 418.7 ma)
Province/Territory: Saskatchewan

Originator: Jamieson, E.R., 1979; Haidl, F.M., 1987.

Type Locality:
No type section has been published. Jamieson (1970, unpub.) suggested a composite section from two cored wells near Taylorton, Saskatchewan: British American Canadian Devonian Quinn 9-34X, in 9-34-3-4W2M, between 2,359.6 and 2,414 m (742 and 7,920 ft) and British American Taylorton 1-8-2-6W2M, between 2,659.7 and 2,691.1 m (8,726 and 8,829 ft).

Restricted to the central Williston Basin in southeastern Saskatchewan, northwestern North Dakota and, possibly, northeastern Montana. Maximum thickness in Saskatchewan is 76 m (249 ft).

Dolomite characterized by brecciated textures, fenestral fabrics and dolomite cements. Yellowish grey to yellowish brown, with abundant pinkish grey, greyish orange, pink, or greyish red interbeds; dolomite cements are commonly white. Quartz silt or sand grains are present in a few beds; sand content increases in the stratigraphically equivalent unit in North Dakota, particularly in the vicinity of the Nesson Anticline.

Disconformably(?) overlies the Cedar Lake Formation and is unconformably overlain by the Ashern Formation (Middle Devonian). Magathan (1987) subdivided the stratigraphically equivalent unit in North Dakota into the following formations, from bottom to top Grondale, Mendenhall, Missouri Breaks and Sherven. The Taylorton is roughly equivalent to the upper Interlake (Porter and Fuller, 1959) and the Risser Beds (Saskatchewan Geological Socitey, 1958).

An informal unit of uppermost Interlake strata in the subsurface of southeastern Saskatchewan. Suggested as a member of the Interlake Formation by Haidl (1987), but not formally defined.

Other Citations:
Haidl, 1987; Jamieson, 1979; Magathan, 1987; Porter and Fuller, 1958, 1959; Saskatchewan Geological Society, 1958.

Haidl, F.M., 1987. Stratigraphic and lithologic relationships, Interlake Formation (Silurian), southern Saskatchewan; in, Summary of Investigations 1987; Saskatchewan Geological Survey, Miscellaneous Report 87-4, pp. 187-193.
Jamieson, E.R., 1979. Well data and lithologic descriptions of the Interlake Group (Silurian) in southern Saskatchewan. Saskatchewan Dept. Min. Res., Rept. 139.
Magathan, E.R., 1987. Silurian Interlake Group:A sequence of cyclic marine and fresh water carbonate deposits in the central Williston Basin. 5th Int. Williston Basin Symp, North Dakota Geol. Surv., Misc. Series 69, p. 59-88.
Porter, J.W. and Fuller, J G.C.M., 1959. Lower Paleozoic rocks of northern Williston Basin and adjacent areas. Amer. Assoc. Petrol. Geol. Bull., v. 43, p. 124-189.
Saskatchewan Geological Society, 1958. Report of the Lower Paleozoic Names and Correlation Committee, Regina.

Source: CSPG Lexicon of Canadian Stratigraphy, Volume 4, western Canada, including eastern British Columbia, Alberta, Saskatchewan and southern Manitoba; D.J. Glass (editor)
Contributor: F.M. Haidl
Entry Reviewed: Yes
Name Set: Lithostratigraphic Lexicon
LastChange: 12 Mar 2009