Named as one of four formations of Supai Group (rank raised) for Manakacha Point on east side of Havasu Canyon, above Supai village, Coconino Co, AZ in the Plateau sedimentary province. Section measured at Manakacha Point is the type section. Is 181 ft thick at type where it overlies (erosion surface) Watahomigi Formation (new) of Supai and unconformably underlies Wescogame Formation (new) of Supai. Forms the lowest massive cliff of Supai and the small bench or slope above it. Consists of cross-bedded limy sandstone or sandy limestone, and minor amount of mudstone. Sandstone ranges from moderate red orange to red purple, very fine grained to fine grained, may be cross stratified on a large scale. Limestone is gray red, light gray, brown gray, or pink, very fine grained, silty, cross stratified on a small to medium scale; some beds are thick, contain abundant chert, and have jasper. Siltstone varies from pale to dark red brown and may be calcareous, shaly, and thin-bedded. Of Atokan (fusulinids) and Atokan? and may be Des Moinesian, or Middle Pennsylvanian age.

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

Rocks formerly included in the Callville Limestone in the extreme western part of the Grand Canyon are assigned to the lower part of the Supai Group (Manakacha Formations). Age is Middle Pennsylvanian.

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