Unit Name: Lone Mountain Formation
Unit Type: Lithostratigraphic
Rank: Formation
Status: Formal
Usage: Currently in use
Age Interval: Silurian (443.7 - 416 ma)
Age Justification: Corals.
Province/Territory: Northwest Territories

Originator: E.M. Kindle and Bosworth, 1921.

Type Locality:
Lone Mountain, immediately south of the mouth of the North Nahanni River near Camsell Bend, Mackenzie River.

It is about 490 m (1,600 ft) at the type section and in the Wrigley - Cap Mountain area and 162 m (530 ft) in the Mount Charles area on the Great Bear River halfway between Great Bear Lake and the Mackenzie River.

Light grey to dark almost black, finely crystalline but some beds with saccharoidal texture dolostone and dolomitic limestone with 15 m (50 ft) of dark grey massive coraline limestone at base.

Underlies dark grey Devonian limestones at the type locality. No indication was given of its upper and lower contacts and no beds were listed below. W.R.S. Henderson (1954a) indicated it changed to an evaporite facies east of Camsell Bend. The formation may be equivalent to the Bear Rock except for the basal 15 m (50 ft).

Douglas and D.K. Norris (1961) subdivided the Lone Mountain Fm into the Arnica and Manetoe formations and possibly some Silurian strata at the base.

Other Citations:
ASPG, 1960; Douglas and D.K. Norris, 1961; W.R.S. Henderson, 1954a; Hume, 1954; E.M. Kindle, 1936; E.M. Kindle and Bosworth, 1921; M.Y. Williams, 1923.

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
Entry Reviewed: Yes
Name Set: Lithostratigraphic Lexicon
LastChange: 29 Apr 2003