Unit Name: Tantalus Formation
Unit Type: Lithostratigraphic
Rank: Formation
Status: Formal
Usage: Currently in use
Age Interval: Late Jurassic ? - Early Cretaceous (161.2 - 99.6 ma)
Age Justification: Plant microfossils.
Province/Territory: Yukon Territory
Originator: Cairnes, 1910.
Type Locality:
Tantalus Butte, Yukon (62 deg 08'N, 136 deg 16'W).
Distribution:
About 305 m (1,000 ft) in the type area; 198 to 229 m (650-750 ft) on Clare Creek, 305 m (1,000 ft) east of Big Salmon (H.S. Bostock and Lees, 1938); about 244 m (800 ft) are exposed on the Ibex River, Whitehorse map-area; about 1,524 m (5,000 ft) near Double Mountain; and 518 to 549 m (1,700-1,800 ft) west of Annie Lake. This formation occurs in the Lewes and Nordenskiold Coal District and in the Whitehorse map-area.
Locality Data:
Thickness(m): Typical 305.
Lithology:
Quartzite, chert and slate rich pebble conglomerate, minor sandstone, shale and some coal.
Relationship:
The Tantalus overlies the Laberge Gp conformably in the Carmacks area, the Yukon Gp (=Yukon Metamorphic Complex) unconformably near Carbon Hill, and is uncon-formably overlain by the Carmacks Volcanics (=Skukum Gp) and Schwatka Andesites (=Hutshi Gp). The Tantalus needs to be separated into an Upper Jurassic-Lower Cretaceous and an Eocene unit. See also Kenai Series.
Other Citations:
H.S. Bostock, 1936; H.S. Bostock and Lees, 1938; Cairnes, 1910, 1912, 1916; Cockfield and Bell, 1926; Wheeler, 1961.
References:
Cairnes, D.D., 1910. Lewes and Nordenskiold Rivers coal district: Geological Survey of Canada, Memoir 5, 70 p.
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; D.J. Tempelman -Kluit
Entry Reviewed: Yes
Name Set: Lithostratigraphic Lexicon
LastChange: 18 Mar 2009