Type Locality:

Dodo Canyon on Macdougal River, District of Mackenzie. Ca. 64 deg 55'N, 127 deg 15'W.

Distribution:

About 46 m (150 ft) and is recognized only in the Carcajou area.

Lithology:

Typically chocolate coloured shale with common greenish beds. Ellipsoidal nodules 5-15 cm (2-6 in) common.

Relationship:

Directly overlies sandstone of the Katherine Gp. Overlain by hard grey scarp-forming limestones of the Echo Canyon Fm. The name Macdougal Gp has been suppressed by Aitken, Macqueen and Usher (1973a).

History:

Aitken, Macqueen and Usher (1973b) state "Recent regional geologic studies in the Mackenzie Mountains indicate that the type Macdougal comprises at least three distinct depositional sequences, separated by two or more regional unconformities. The lowest unit, 220 feet of reddish brown nodular shale, has been traced to the southwest where it underlies up to 11,000 feet of Proterozoic strata assigned to the Little Dal, Rapitan, Keele, and Sheepbed Formations, all of which are missing at Dodo Canyon. A middle sequence, 350 feet thick, consists of fossiliferous, Lower and Middle Cambrian limestone, shale, and sandstone, and corresponds in part to the Mount Cap Formation of Franklin Mountains. It is of limited distribution in the frontal Mackenzies because of depositional thinning and removal by erosion at subsequent unconformities. An upper sequence, 420 feet of gypsum, red beds and dolomite, is assigned to the Saline River Formation. It overlies an unconformity believed to be the regional ''sub-Upper Cambrian" unconformity and is overlain gradationally by a carbonate sequence containing Dresbachian to Canadian fossils, assigned to the post "Macdougal" Franklin Mountain Formation."

Other Citations:

Aitken, Macqueen and Usher, 1973a, 1973b; ASPG, 1960; Nauss, 1944.