Type Locality:

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

Distribution:

33 m (100 ft).

Lithology:

Dark grey limestone and chocolate coloured shale with some siltstone.

Relationship:

Overlies the Sanguine Fm. The base of this unit correlates with the Saline River Fm whereas the upper dark grey limestone correlates with the base of the Franklin Mountain Fm. These latter two formation names are in wide use. Aitken, Macqueen and Usher (1973a) have suppressed the use of Macdougal Gp and replaced it with Little Dal Fm.

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; Hume, 1954; Nauss, 1944.