Unit Name: Grizzly Bear Formation
Unit Type: Lithostratigraphic
Rank: Formation
Status: Formal
Usage: Currently in use
Age Interval: Middle Devonian (397.5 - 385.3 ma)
Age Justification: Corals.
Province/Territory: Northwest Territories

Originator: Gabrielse et al., 1973.

Type Locality:
On the northeast limb of Grizzly Bear Anticline, 2.4 km ( 1.5 mi) northwest of Grizzly Bear Lake (62°42'N, 127°50'W). Glacier Lake map-area, District of Mackenzie.

Distribution:
The formation is 256 m (840 ft) thick in the type section, 18 m (60 ft) 19 km (12 mi) to the southeast, 40 m (130 ft) in the vicinity of Avalanche Lake and 56 m (185 ft) on the southwest limb of the Grizzly Bear Anticline. The formation is restricted to the Glacier Lake map-area.

Lithology:
Cliff-forming, massive, light grey weathering limestone and locally dolomite sequence. At the type section the formation, in ascending order, can be subdivided into: 1) 46 m (150 ft) recessive, coarsely crystalline and porous, cryptograined limestone; 2) 30.5 m (100 ft) resistant, massive, cryptograined limestone; 3) 30.5 m (100 ft) massive cryptograined limestone with biostromal layers of colonial tetracorals; 4) 152 m (500 ft) very coarsely crystalline light grey weathering, black and grey crinoidal limestone and coarse calcarenite in beds 0.3 - 1.3 m (1 - 4 ft) thick. About 19 km (12 mi) to the southeast of the type section it consists of about 18 m (60 ft) of light grey to white weathering, porous, coarse-grained, dolomite.

Relationship:
The Grizzly Bear Formation conformably overlies the Arnica Formation and may be its facies equivalent and is conformably overlain by the Funeral Formation.

References:
Gabrielse, H., Blusson, S.L., and Roddick, J.A., 1973. Geology of the Flat River, Glacier Lake and Wrigley Lake map-areas, District of Mackenzie and Yukon Territory; Geological Survey of Canada, Memoir 366 (Parts I and II), 421 p.

Source: CSPG Lexicon of Canadian Stratigraphy, Volume 2, Yukon Territory and District of Mackenzie; L.V. Hills, E.V. Sangster and L.B. Suneby (editor)
Contributor: L.V. Hills; H. Gabrielse
Entry Reviewed: Yes
Name Set: Lithostratigraphic Lexicon
LastChange: 01 Dec 2010