Permian glaciated bedrock surfaces and associated sediments on Kangaroo Island, South Australia: implications for local Gondwanan ice-mass dynamics

Late Palaeozoic glaciated rock surfaces and associated sediments occur alon g the northeastern coast of Kangaroo Island. The erosional forms include gl acially polished rock surfaces, striae, grooves, chatter marks, friction cr acks, crescentic gouges, p-forms, sichelwannen, miniature rock crag-and-tai ls and roches moutonnees. The distribution and orientation of these along w ith till fabrics indicate a general northwesterly ice flow in this part of the Troubridge Basin. The glacial erosional forms and the presence of thick lodgement till imply that the local basal ice was at pressure-melting poin t during their formation. Temperate to subpolar glacial ice conditions, sim ilar to those currently prevailing in glaciers in Spitsbergen. are inferred .