Two lake level phases are believed to be preserved in the Grand Island Tombolo’s stratigraphy. The historic strandplain, shoreface contact is interpreted as a historic lake level approximately 15m below the tombolo’s surface. Contemporary lake levels are preserved as the contact between modern the modern strandplain and shoreface.



This is supported by interpretation of historic lake levels based on a drill core collected by nearby Beaver Lake (Fisher, 1999) This core shows a sand unit beginning 14m below modern lake level that believed to represent the same lake level interpreted from our GPR transect.

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