The upper Paleozoic Whiteout Conglomerate, situated conformably upon the Crashsite Group and overlain conformably by the Polarstar Formation, may represent the entire period of Gondwanaland glaciation in West Antarctica. The formation, mainly massive diamictites, makes up about 1,000 m of a 13,000-m-thick total stratigraphic column in the Ellsworth Mountains.

In the northern Sentinel Range, the Whiteout Conglomerate contains as many as six dark gray to black, thick, massive-bedded diamictites that are separated by recessive layers of laminated to thin-bedded shale, mudstone, and sandstone as thick as 15 m. Clasts greater than 5 mm in diameter compose 3 to 10 percent...