Unit Name: Manuel Creek Formation
Unit Type: Lithostratigraphic
Rank: Formation
Status: Formal
Usage: Currently in use
Age Interval: Toarcian - early Bajocian (183 - 169.6 ma)
Age Justification: Ammonites including Dactylioceras, Pseudolioceras, Erycitoides, and bivalves, belemnites, Foraminifera, and palynomorphs.
Province/Territory: Northwest Territories; Yukon Territory
Originator: Poulton, Leskiw and Audretsch, in press.
Type Locality:
North part of Murray Ridge (68 deg 01'45"N, 136 deg 26'30"W) overlooking Manuel Creek, District of Mackenzie.
Distribution:
It is widespread in the Richardson Mountains and western Mackenzie Delta north of approximately 67 deg 45'N. It thickens northwestward, from 52 m (170 ft) near the head of Martin Creek (68 deg 05'40"N, 136 deg 11'30"W) to at least 124 m (407 ft) near the head of Waters River (67 deg 45'N, 137 deg 19'W).
Lithology:
The formation consists of two members: 1) unnamed lower member, recessive, argillaceous, bioturbated, carbonaceous siltstone and shale or mudstone with small spheroidal weathering ferruginous, calcareous and locally pyritic concretions. Siltstones and fine-grained sandstone interbeds occur in the upper 20 m (66 ft); and 2) Anne Creek Member, resistant, rusty weathering sandstone containing Erycitoides, locally developed and equivalent to the upper sandstones elsewhere.
Relationship:
It overlies the Almstrom Fm with either sharp or gradational contact and is overlain abruptly by the Richardson Mountains Fm. It is absent by erosion in the Bug Creek-Jurassic Butte area (68 deg 05'N, 135 deg 28'W) and southward where the Richardson Mountains Fm rests on older Jurassic or Paleozoic strata, and therefore was not recognized by Jeletzky (1967) in his original description of the Bug Creek Fm. It is the "middle Kingak tongue" of Poulton (1978a).
Other Citations:
Jeletzky, 1967; Poulton, 1978a; Poulton et al. , in press.
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: T.P. Poulton; L.V. Hills
Entry Reviewed: Yes
Name Set: Lithostratigraphic Lexicon
LastChange: 29 Apr 2003