Unit Name: Chedabucto Lake Formation
Unit Type: Lithostratigraphic
Rank: Formation
Status: Formal
Usage: Currently in use
Age Interval: Late Ordovician (460.9 - 443.7 ma)
Age Justification: Colonial corals, brachiopods, trilobites and graptolites.
Province/Territory: Northwest Territories
Originator: A.W. Norris, 1965.
Type Locality:
Composite and compiled from outcrops in the vicinity of Chedabucto Lake. 62 deg 21'07"N, 115 deg 36'W.
Distribution:
0 m Alexander Point Area, 0 to 76 m (0-250 ft) west of Faber Lake. Known to occur from immediately south of Alexander Point to north of Faber Lake, Great Slave Lake region.
Lithology:
Thickly-bedded to massive dolomite, red to brown in south, grey in north, purplish-red mottling present in southern outcrops, some chert and silicified fossils, sandy and conglomeratic over Precambrian knobs.
Relationship:
Sharp but transitional into underlying La Martre Falls Fm and unconform-able with the overlying Chinchaga Fm. Locally rests directly on Precambrian rocks. This formation first appears as a lentil within the uppermost part of the Mirage Point Fm south of Alexander Point. Referred to as map-unit 10 by Douglas and A.W. Norris (1960).
Other Citations:
Douglas and A.W. Norris, 1960; Lord, 1939; A.W. Norris, 1965.
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