Unit Name: Brent Island formation
Unit Type: Lithostratigraphic
Rank: Formation
Status: Informal
Usage: Currently in use
Age Interval: Early Ordovician (485.4 - 470 ma)
Province/Territory: Newfoundland & Labrador
Originator: Stouge, 1983.
Type Locality:
The reference section is on Brent Islands (Cawood, 1993).
Lithology:
Bands of white, grey, and bluish-grey marble are interbedded with limestones and dolostones (Howse, 2004). Characterized by well developed sponge and stromalite mounds in the reference section on Brent Islands (Stevens and James, 1975) (Cawood, 1993).
Relationship:
Part of the lower St. George Group (Cawood, 1993).
History:
Stouge (1983) divided the carbonate rocks within the White Arm Pond Window into the Brent Island and Southern Arm formations of the Lower Ordovician St. George Group (Howse, 2004).
References:
Cawood, Peter, A., 1993. Report to Vinland Petroleum Inc. on resource potential of west Newfoundland, exploration parcels 8 and 9. Centre For Earth Resources Research, Department Of Earth Sciences, Memorial University Of Newfoundland, St. John's, Newfoundland, EL# 92-105-01-EG.
Howse, A.F., 2004. Industrial mineral potential of the Lower Paleozoic carbonate rocks of western Newfoundland. Government of Newfoundland and Labrador, Department of Mines and Energy, Geological Survey, Open File NFLD/2853.
Stevens, R.K., and James, N.P., 1975. Large sponge like reef mounds from the Lower Ordovician of west Newfoundland. Abstract, Annual Meeting, Geological Society of America, Denver, Colorado, p. 1122.
Stouge, S., 1983. Notes on the geology of the St. Julien's map-area (2 M/4), Great Northern Peninsula Newfoundland: Newfoundland Department of Mines and Energy, Mineral Development Division.
Source: CSPG Lexicon of Canadian Stratigraphy, Volume 6, Atlantic Canada; G.L. Williams, L.R. Fyffe, R.J. Wardle, S.P. Colman-Sadd, Boehner, R.C. (editor)
Contributor: Michael Pashulka
Entry Reviewed: No
Name Set: Lithostratigraphic Lexicon
LastChange: 15 Feb 2011