Calcareous Till Facies North of Lake Superior, Ontario: Implications for Laurentide Ice Streaming

摘要: In the Geraldton and Hemlo areas distantly-derived carbonate tills lie between slightly to non-calcareous can be distinguished by textural, carbonate, clast compositions. Their occurrence uniform character over large of Shield attest high sediment flux rapid movement distal debris within southern part Laurentide Ice Sheet. This is consistent with low surface profiles reconstructed for Superior Michigan lobes which were likely fed ice north probably affected streaming. Till deposition in explained one southwestward glacial advance. A broad stream issued out James Bay up Albany conduit zones normal velocity marginal area. It may have split flow down Drowning Kenogami troughs. Eventually, streaming reached where uplands induced lee side extending flow, downward transport, lodgment calcareous englacial on local tills. Following maximum much was laid subglacial meltout. However, a reactivation occurred moulded drumlins near deposited an upper till at Hemlo. Final decay resulted meltout supraglacial that had been sheared or glacier from stoss sides uplands.