Unit Name: Landry Formation
Unit Type: Lithostratigraphic
Usage: Currently in use
Age Interval: Devonian (416 - 359.2 ma)
Age Justification: Brachiopods.
Province/Territory: Northwest Territories
Originator: Douglas and Norris, 1961.
No type designated.
The Landry Formation is 122-152 m (400-500 ft) thick on the Whittaker Range, 91 m (300 ft) on the Delorme Range, 178 m (585 ft) on the northeast flank of the Rouge Range, only 23 m (75 ft) in the Tigonankweine Syncline and 152 to 488 m (500-1,600 ft) in the southwestern Wrigley map-area and adjacent Sekwi Mountain and Nahanni map areas. It is found in the Franklin and Mackenzie mountains.
Resistant, cliff-forming, grey weathering, thick to massive bedded, cryptograined limestones. Locally it is mottled with medium to dark grey dolomite. In the Whittaker Range, it is comprised of medium-grey to black, crypto- to medium-grained, in part pelletoidal and fossiliferous limestone. In the Wrigley area, alternating light grey and dark grey weathering imparts a distinctive banding to the formation. Locally, the formation is reefal.
It conformably overlies the Arnica Formation in the Wrigley Lake, Rouge Range and Tsezotene Rage (Tigonankweine Syncline), the Manetoe Formation in the Thundercloud Range, the Natla in the southwestern Wrigley Lake map-area, the Funeral in the Grizzly Bear Lake and Broken Skull Syncline area (Gabrielse et al., 1973). The boundary with the Natla Formation is placed at the highest occurrence of sooty-recessive limestone. In the northeasternmost Nahanni area, the Landry grades southeastwards into strata typical of the Funeral Formation. The formation is overlain by the Headless or Hume formations. It may be equivalent to part of the Chinchaga Formation. It may interbed with the Manetoe Formation (Morrow, 1977). Eastward it is equivalent in part to the Bear Rock Formation. Aitken et al. (1982) equates the Landry with the Pellet limestone member of the Gossage Formation.
Blusson, 1971; Chatterton, 1978; Collins, 1969, Dean, 1969; Douglas and Norris, 1963; Gabrielse, 1967a; Gabrielse et al., 1965; Law, 1971; Noble and Ferguson, 1971; Norford et al., 1970.
Aitken, J.D., Cook, D.G., and Yorath, C.J., 1982. Upper Ramparts River (106 G) and Sans Sault Rapids (106 H) map areas, District of Mackenzie, Northwest Territories; Geological Survey of Canada, Memoir 388, 48 p.
Blusson, S.L., 1971. Sekwi Mountain map-area, Yukon Territory and District of Mackenzie (105 P); Geological Survey of Canada, Paper 71-22, 17 p. + "A" Series Map 1333A, Geology, Sekwi Mountain, Northwest Territories - Yukon Territories; Scale: 1:250 000.
Chatterton, B.D.E., 1978. Aspects of late Early and Middle Devonian conodont biostratigraphy of western and northwestern Canada; in, Western and Arctic Canadian biostratigraphy, Stelck, C.R. and Chatterton, B.D.E. (Eds.); Geological Association of Canada, P.S. Warren biostratigraphy symposium Western and Arctic Canadian biostratigraphy, Edmonton, AB, (May 19, 1976) (Conference), Special Paper 18, pp. 161-231.
Collins, D.H., 1969. Devonian nautiloids from northern Canada; in, Contributions to Canadian Paleontology (eleven papers), by Norford, B.S.; Jacksen, D.E. and Lenz, A.C.; Collins, D.H.; Dean, W.T.; McGregor, D.C.; Bamber, E.W.; Nassichuk, W.W.; Ross, Charles A.; Wickenden, R.T.D.; Hills, L.V. and Wallace, Sandra; Rafuse, Marguerite (Ed.); Department of Energy, Mines and Resources, Geological Survey of Canada, Bulletin 182, pp. 31-50.
Dean, W.T., 1969. An occurrence of the trilobite Dechenella (Dechenella) in the Middle Devonian Landry Formation, western District of Mackenzie; in, Contributions to Canadian Paleontology (eleven papers), by Norford, B.S.; Jacksen, D.E. and Lenz, A.C.; Collins, D.H.; Dean, W.T.; McGregor, D.C.; Bamber, E.W.; Nassichuk, W.W.; Ross, Charles A.; Wickenden, R.T.D.; Hills, L.V. and Wallace, Sandra; Rafuse, Marguerite (Ed.); Department of Energy, Mines and Resources, Geological Survey of Canada, Bulletin 182, pp. 51-53.
Douglas, R.J.W. and Norris, D.K., 1961. Camsell Bend and Root River map-areas, Northwest Territories; Geological Survey of Canada, Paper 61-13, 36 p.
Douglas, R.J.W. and Norris, D.K., 1963. Dahadinni River and Wrigley map-areas, District of Mackenzie, Northwest Territories; Geological Survey of Canada, Paper 62-33, 34 p.
Gabrielse, H., 1967a. Tectonic evolution of the northern Canadian Cordillera; Canadian Journal of Earth Sciences = Journal Canadien des Sciences de la Terre, vol. 4, no. 2, pp. 271-298.
Gabrielse, H., Blusson, S.L., and Roddick, J.A., 1973. Geology of the Flat River, Glacier Lake and Wrigley Lake map-areas, District of Mackenzie and Yukon Territory; Geological Survey of Canada, Memoir 366 (Parts I and II), 421 p.
Gabrielse, H., Roddick, J.A., and Blusson, S. L., 1965. Flat River, Glacier Lake and Wrigley Lake, District of Mackenzie and Yukon Territory, 95E, 95L and 95M (Report and Maps 35-1964, 36-1964, and 37-1964); Geological Survey of Canada, Paper 64-52, 30 p. + Preliminary Map 35-1964, Geology, Flat River, Yukon Territory - District of Mackenzie, Scale 1:253 440 or 1 inch to 4 miles, Preliminary Map 36-1964, Geology, Glacier Lake, District of Mackenzie, Scale 1:253 440 or 1 inch to 4 miles, and Preliminary Map 37-1964, Geology, Wrigley Lake, District of Mackenzie, Scale 1:253 440 or 1 inch to 4 miles.
Law, James, 1971. Regional Devonian geology and oil and gas possibilities, upper Mackenzie River area; Canadian Society of Petroleum Geologists (CSPG), Bulletin of Canadian Petroleum Geology, vol. 19, no. 2 (June), pp. 437-484.
Morrow, D.W., 1977. The Prairie Creek Embayment and associated slope, shelf, and basin deposits; in, Report of Activities, Part A, Blackadar, R.G., Griffin, P.J., Dumych, H., and Irish, E.J.W. (Eds. and Compilers); Geological Survey of Canada, Paper 77-1A, pp. 361-370.
Noble, J.P.A. and Ferguson, R.D., 1971. Facies and faunal relations at edge of early mid-Devonian carbonate shelf, south Nahanni River area, N.W.T.; Canadian Society of Petroleum Geologists (CSPG), Bulletin of Canadian Petroleum Geology, vol. 19, no. 3 (September), pp. 570-588.
Norford, B.S., Braun, W.K., Chamney, T.P., Fritz, W.H., McGregor, D.C., Norris, A.W., Pedder. A.E.H., and Uyeno, T.T., 1970. Biostratigraphic determinations of fossils from the subsurface of the Yukon Territory and the Districts of Mackenzie and Franklin (Report and 1 figure); Geological Survey of Canada, Paper 70-15, 19 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
Entry Reviewed: Yes
Name Set: Lithostratigraphic Lexicon
LastChange: 01 Dec 2010