Named as formation in vicinity of Mackenzie River Valley, Mackenzie trough, Northwest Territories, CN. Named for Little Bear River. Type section on the Little Bear River. Overlies Slater River formation (new). Underlies East Fork formation (new). Consists of sandstone, some conglomerate, sandy shales, and coal seams. Beds are lenticular and so small and local in distribution that their correlation from place to place is difficult and uncertain. In general, any sandy series lying above shales of the Slater River type may be tentatively correlated with Little Bear. Complete section of unit is not known; where best exposed, all but the lower part has been eroded. Thickness of 780 ft exposed on Little Bear River. Age is determined from evidence of marine, brackish, and fresh-water fossils [none listed]. Assigned a Late Cretaceous age.

Source: GNU records (USGS DDS-6; Denver GNULEX).