The Cottons Breccia (Ediacaran) and its tectonostratigraphic context within the Grassy Group, King Island, Australia: A rift-related gravity slump deposit

In this paper, we review the tectonostratigraphy of the Cottons Breccia, and the enclosing Grassy Group. We find no unambiguous evidence for a direct glacial origin, as postulated by some early workers. An interpretation of the Cottons Breccia as a deposit within half-graben in the shoulder regions of an actively developing latest Neoproterozoic volcanic rifted margin is consistent with all the available sedimentological, structural, geochronological, and tectonic evidence.