CGRG Bibliography of Canadian Geomorphology
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Author : Blasco, S.; Promaine, A.; Shearer, J.; Lewis, M.; and Fox, B.
Date : 2003.
Title : Rediscovering past landscapes: mapping ancient river channels, waterfalls, beaches and caves on the lakebed of Fathom Five National Marine Park.
Publication : CAA 2003. Current and Future Directions in Canadian Archaeology. 36th Annual Conference of the Canadian Archaeological Association, May 7-10, 2003. McMaster University, Hamilton, Ontario.
Issue :
Page(s) :
Abstract
New high-resolution digital sonar mapping techniques have been employed to investigate the Huron-Georgian Bay lakebed between Tobermory and Fitzwilliam Island. Four bedrock channels, 3 drowned waterfalls, and several relict beaches and caves have been located and mapped in water depths ranging from 15 to 90 metres. The now submerged Niagara Escarpment north of Tobermory was subaerially exposed for at least 3 time periods between 9600 and 7200 years ago. Lake waters were 30 to 55m lower than present. During these low lake stands the 4 bedrock channels were occupied by waters flowing from Lake Huron into Georgian Bay over 3 ancient waterfalls. Bedrock caves and beaches were exposed or were generated. Low lake shorelines, riverbanks, beaches and caves would have formed potential occupation sites for paleoindians migrating across this ‘landbridge’ between the Bruce Peninsula and Manitoulin Island.
Bibliography of Canadian Geomorphology