Unit Name: Michelle Formation
Unit Type: Lithostratigraphic
Rank: Formation
Status: Formal
Usage: Currently in use
Age Interval: Pragian - early Zlichovian (411.2 - 402.3 ma)
Age Justification: Some beds richly fossiliferous and include sponges, stromatoporoids, corals, bryozoans, brachiopods, cricoconarids, pelecypods, goniatites, trilobites and conodonts.
Province/Territory: Yukon Territory

Originator: A.W. Norris, 1968.

Type Locality:
In northern Ogilvie Mountains, 1.6 km (1 mi) west-northwest of Hart River at 65 deg 38'-38.5'N, 136 deg 45.6'-45.2'W.

Locally developed within the northeastern part of the Ogilvie Mountains, west of the southern part of the Richardson Mountains. Thickness ranges from 56 m ( 184 ft) on the northeast flank of Nahoni Range to 195 m (641 ft) immediately east of Blackstone River.

Consists mainly of interbedded black, calcareous shales and abundantly fossiliferous black, fine-grained to aphanitic, argillaceous and silty limestones and dolomites weathering orange and brown.

Transitionally overlies shales of the Road River Fm with the contact placed at the first appearance of closely spaced interbeds of argillaceous limestone and dolomite, and is sharply overlain by more resistant light coloured carbonates of the Ogilvie Fm. The Michelle Fm is equivalent to the upper part of the Gossage Fm to the east.

Other Citations:
Copeland, 1977; Fahraeus, 1971; Ludvigsen, 1970; A.W. Norris, 1967a, 1967b, 1968; Ormiston, 1971; Perry and Lenz, 1978.

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; A.W. Norris
Entry Reviewed: Yes
Name Set: Lithostratigraphic Lexicon
LastChange: 29 Apr 2003