 The Beardmore orogeny occurred during the Late Proterozoic, and is recognized in the central Transantarctic Mountains, with Cambrian limestones unconformably overlying deformed strata.Associated igneous activity resulted in batholiths (620 Ma) and pyroclastics (633 Ma).These pyroclastics overlie argillite-graywacke sequences in Queen Maud Land, the Horlick Mountains, and the Thiel Mountains.