 Within the deposits of Lorrain Formation, the jasper conglomerates occur principally as the sedimentary fills of erosional troughs and channels of what are interpreted to be either alluvial fans or deposits of braided river.These deposits are inferred to be nonglacial in origin and immediately postdate the Paleoproterozoic Makganyene glaciation.Elsewhere, e. g. in Drummond Island, Michigan, United States, jasper conglomerate, there denominated "Drummond Island puddingstone", occurs as loose gravel within Pleistocene glacial drift.