CGRG Bibliography of Canadian Geomorphology
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Author : Cameron, G.
Date : 1991
Title : Seismostratigraphy of Late Quaternary sediments and lake level history, Eastern Lake Erie.
Publication : Unpublished M. Sc thesis, Dalhousie University.
Issue :
Page(s) : 175 p.
Abstract
Seismo- and lithostratigraphic analysis of unconsolidated sediments in the Long Point area of eastern Lake Erie reveals two stratigraphic sequences. The lower sequence forms a wedge of material, thickest in the centre of the basin (ca 50 m), which thins shoreward where it commonly pinches out against an overlying regional unconformity. This lower sequence comprises glacial drift and stratified proglacial and postglacial sediments. The upper sequence forms a continuous wedge-like cover, up to 40 m thick in the centre of the basin, which thins shoreward. The upper sequence (Holocene in age) consists of aminated or massive muds, muddy sandy lag and contains, in places, relict brown and gray beach sand at ca 20 to 30 meters below datum (m.b.d.). Port Huron Ice reached Long Point Bay between 12.5 and 13 ka depositing glacial drift on the basin flanks and bedrock highs while delivering fine-grained sediments to deeper portions of the basin. Ice retreat about 12.5 ka lowered lake levels and allowed drainage over the Niagara escarpment. Lake levels were probably maintained above present lake level by high volume low over moraine crests.
Bibliography of Canadian Geomorphology