Relict shoreline features at Cockburn Island,Ontario |
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| Authors: | Scott A Drzyzga |
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| Institution: | (1) Geography & Earth Science Department, Shippensburg University, 1871 Old Main Drive, Shippensburg, Pennsylvania 17257, USA |
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| Abstract: | Cockburn Island, Ontario (45°55′ N, 83°20′ W), holds at least six sets of elevated lake bluffs, scarps and bar deposits that
mark distinctive water planes above the Nipissing Great Lakes water plane (∼198 m). These relict shoreline features occur
at elevations that correspond closely with the elevations of others at nearby St. Joseph Island and in eastern upper Michigan.
Together, the elevations and relative locations of steep relict bluffs suggest a proto-Cockburn Island once interrupted the
surface of proglacial Lake Algonquin. The islet appears to have emerged and grown through a period of uplift and a sequence
of lowering water levels. The highest relict shoreline (280.2 m) is correlated with the Main phase of Lake Algonquin. Lower
shorelines at Cockburn Island cannot be correlated consistently, so additional work is required.
This is the seventh in a series of ten papers published in this special issue of Journal of Paleolimnology. These papers were
presented at the 47th Annual Meeting of the International Association for Great Lakes Research (2004), held at the University
of Waterloo, Waterloo, Ontario, Canada. P.F. Karrow and C.F.M. Lewis were guest editors of this special issue. |
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| Keywords: | Lake Algonquin Lake Huron Ontario Michigan Lake levels |
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