Unit Name: Flotten Lake Sand
Unit Type: Lithostratigraphic
Rank: Formation
Status: Formal
Usage: Currently in use
Age Interval: late Albian (106.4 - 99.6 ma)
Province/Territory: Alberta; Saskatchewan

Originator: Simpson, F., 1975, in prep.

Type Locality:
The type section is in the D.M.R. Flotten Lake No. 2 well, in 4-10-65-17W3M, Waterhen Lake, west-central Saskatchewan, between 180.4 and 199.3 m (592 to 654 ft). Since no geophysical well logs were run in the type well, the electric-log section from 287.1 to 303.2 m (942 to 995 ft) in the Clark Flotten Lake 4-22-66-17W3M well is used as a reference.

Distribution:
The thickness of the unit in the type section is 18.9 m (62 ft). South of Meadow Lake a maximum value of about 21.3 m (70 ft) is encountered. The Flotten Lake Sand is restricted in distribution to the western part of a prominent structural platform in west-central Saskatchewan and adjacent east-central Alberta, the southern limit of which is approximately delineated by the valley of the modern North Saskatchewan River. The unit is a relatively coarse grained wedge which undergoes progressive grain size diminution and thickness decrease in a southwesterly direction to pinch out along the southern margin of the platform.

Lithology:
Variably consolidated, well-washed, fine- to medium-grained sand and sandstone, and shaly, fine-grained sandstone. The well-washed sands and sandstones are quartz-rich and cross-laminated. The shaly sandstones and siltstones form irregular thin, graded layers, interbedded with mudstones of similar thickness.

Relationship:
The Flotten Lake Sand rests conformably on shales of the Joli Fou Formation and is conformably overlain by shales of the Big River Formation. It is the approximate lithostratigraphic equivalent of the northeastward thinning Viking Formation of southern Saskatchewan and adjacent areas. To the southeast of Meadow Lake the Big River shale between the Flotten Lake Sand and the St. Walburg Sandstone pinches out and the two relatively coarse-grained units form a single sandy sequence.

Other Citations:
McNeil and Caldwell, 1981; Simpson, 1975, 1980.

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. Simpson
Entry Reviewed: Yes
Name Set: Lithostratigraphic Lexicon
LastChange: 17 May 2004