Unit Name: Ford Lake Shale
Unit Type: Lithostratigraphic
Rank: Formation
Status: Formal
Usage: Currently in use
Age Interval: Late Devonian - Visean (385.3 - 328.3 ma)
Age Justification: Biostratigraphy (Pugh, 1983)
Province/Territory: Yukon Territory
Originator: Brabb, 1969.
Type Locality:
The type locality was established on the east and west banks of the yukon Riverin Alaska, from about 3.2 km east of Ford Lake to about 3.2 km northeast of the lake (Brabb, 1969). Pugh (1983) selected a reference section in the Yukon in the Socony North Cath B-62 well.
Distribution:
The Ford Lake shale extends from Alaska northeastwards in the northern Ogilvie Mountains - Peel River area (Pugh, 1983).
Locality Data:
WELL 300B626620138300; N. CATH Y.T. B-62. Thickness(m): Maximum 975.
Lithology:
Predominantly greyish-black siliceous shale and laminated greyish-black chert that splits with a slabby parting at the type locality (Brabb, 1969). At the reference section and other wells in the yukon, the Ford Lake Shale is a brown-black, bituminous, pyritic shale, locally silty, rarely sandy (Pugh, 1983).
Relationship:
The Ford Lake Shale overlies the dark grey micaeous shale of the Imperial Formation, and is overlain conformably by the Hart River Formation of limestone, dolostone and chert (Pugh, 1983). Northwest from the reference section, the Ford Lake Shale grades into and intertongues with the arenaceous Tuttle Formation (Pugh, 1983).
History:
Bamber and Waterhouse (1971) correlated their "unit 1" shale with the Ford Lake Shale of Brabb (1969). The shale unit has also been informally referred to as the "Parkin Creek" (Pugh, 1983).
References:
Bamber, E.W. and Waterhouse, J.B., 1971. Carboniferous and Permian stratigraphy and paleontology, northern Yukon Territory, Canada [Including appendices on foraminifera, Brachiopoda, and type and reference sections by Mamet, B.L. and Ross, C.A.]; Canadian Society of Petroleum Geologists, Bulletin of Canadian Petroleum Geology, vol. 19, no. 1 (March), pp. 29-250.
Brabb, E.E., 1969. Six new Paleozoic and Mesozoic formations in west-central Alaska; United States Geological Survey (USGS), Bulletin 1274-I, 26 p.
Pugh, D.C., 1983. Pre-Mesozoic geology in the subsurface of Peel River map area, Yukon Territory and District of Mackenzie; Geological Survey of Canada, Memoir 401, 61 p.
Source: GSC file of geological names; T.E. Bolton and J. Dougherty (compiler)
Contributor: P.H. Davenport
Entry Reviewed: No
Name Set: Lithostratigraphic Lexicon
LastChange: 25 Nov 2008