Type Locality:

East Arm of Great Slave Lake. See individual component formations for specific localities.

Distribution:

Maximum thickness over 12,192+ m (4,000+ ft). The group is found in the area of the East Arm, Great Slave Lake.

Lithology:

The group is composed of eight component formations listed in ascending order: 1) Douglas Peninsula, 17-34 m (55-110 ft), marlstone, red-brown, laminated, gypsum casts; argillite, hematitic limestone and jasper nodules; 2) Taltheilei, 0-119 m (0-390 ft), dolomite, brown, medium-to thin-bedded, fine-grained, crystalline, stromatolitic laminated or massive; stromatolitic limestone with dolomite laminations; calcite cemented dolarenite, dolorudite; 3) Utsingi, 0-274 m, (0-900 ft), limestone, grey, medium- to thick-bedded, medium-grained, crystalline, mottled to laminated; minor stromatolitic limestone; 4) McLean, 0 - 120 m (0-395 ft), argillite, red-brown, very thin-bedded, calcareous, interbedded limestone of limestone nodules; some sections extensively dolomitized, 5) Blanchet, 0-303 m (0-995 ft), greywacke, dark red-brown to dark green, thin-bedded, graded bedding, interbedded argillite and interlaminated argillite and limestone, argillite with limestone nodules; 6) Pekanatui Point, 0-104 m (0-340 ft), limestone, white, very thin-bedded, aphanitic; very thinly interbedded limestone and argillite; argillite with limestone nodules; interbedded greywacke and argillites nodular argillaceous dolomite and limestone; "debris flow" breccia beds; some sections, extensively dolomitized; 7) Wildbread, 0-183 m (0-600? ft), limestone, grey to white, thin- to medium-bedded, oolitic, stromatolitic, laminated, mottled, or crystalline; minor dolomite, stromatolitic; some sections extensively dolomitized; and 8) Hearne, 0¿91 m (0-300 ft), limestone, grey to white, thick bedded medium- to coarse-grained, crystalline, massive to mottled; minor stromatolitic limestone and dolomite.

Relationship:

This group is conformable with the underlying Kahochella Gp and is disconformably overlain by the Christie Bay Gp. Internally formations are conformable. Hoffman (1968, 1973a, 1974) grouped the Taltheilei, Utsingi, Wildbread and Hearne formations into a "carbonate platform sequence" and correlated them with the Douglas Peninsula, McLean, Blanchet and Pekanatui Point formations of a terrigenous basinal sequence.

Other Citations:

Hoffman, 1967, 1968, 1969, 1970, 1973a, 1973b, 1974, 1978; Hoffman et al., 1970; Hoffman et al., 1977.