Unit Name: Triune Formation
Unit Type: Lithostratigraphic
Rank: Formation
Status: Undefined
Usage: Currently in use
Age Interval: Cambrian - Devonian (542 - 359.2 ma)
Province/Territory: British Columbia

Originator: Fyles and Eastwood, 1962

Distribution:
The Triune Formation varies greatly in thickness . It reaches approximately 305 metres on the northwest side of Gainer Creek and thins rapidly to the southeast pinching out in the cliffs north of Redcliff Peak.

Locality Data:
Thickness(m): Minimum 0, Maximum 305.

Lithology:
The Triune Formation consists of laminated to medium-bedded, grey to black phyllite, slate and argillite.

Relationship:
The Triune Formation belongs to the Lardeau Group. The formation is gradational with the overlying Ajax Formation and is conformable with the underlying Index Formation.

References:
Fyles, James T. and Eastwood, G.E.P., 1962. Geology of the Ferguson area, Lardeau District, British Columbia; British Columbia Department of Mines and Petroleum Resources, Bulletin No. 45, 92 p. + XIV plates.

Source: LEXICON_BC
Contributor: Holly Girling
Entry Reviewed: No
Name Set: Lithostratigraphic Lexicon
LastChange: 05 Mar 2009