Cowan, Beth (2015) Shorelines beneath the sea: Geomorphology and characterization of the postglacial sea-level lowstand, Cumberland Peninsula, Baffin Island, Nunavut. Masters thesis, Memorial University of Newfoundland.
- Accepted Version
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This thesis presents the discovery of eight submerged deltas (-19 to -45m), the first documented submerged boulder barricade, a submerged sill platform and spits off the coast of Cumberland Peninsula, eastern Baffin Island, NU. The geomorphic characteristics of these features in relation to contemporaneous sea-level are presented and compared with the modern shore-zone. The submerged boulder barricade at Qikiqtarjuaq in the west indicates a -16 m sea level that isolated Broughton Channel from Baffin Bay to the north, changing the coastal dynamics from those observed at present. A shoreline deeper than -50 m planed off the fiord-mouth sill in Akpait Fiord and formed spits at -50 m and -30 m present depth. These features define a submerged shoreline gradient of 0.35 m/km to the east across northeastern Cumberland Peninsula. The linear gradient sediment supply requirements for delta formation suggest a synchronous lowstand, bracketed by ice margins and sourced from glacial outwash between 11.8-8.5 ka. This confirms the submergence trend hypothesized for eastern Cumberland Peninsula (Dyke, 1979).
|Item Type:||Thesis (Masters)|
|Additional Information:||Includes bibliographical references.|
|Keywords:||submerged shorelines, multibeam bathymetry, postglacial sea level, Cumberland Peninsula, Coastal geomorphology|
|Department(s):||Humanities and Social Sciences, Faculty of > Geography|
|Geographic Location:||Nunavut--Baffin Island|
|Library of Congress Subject Heading:||Submerged lands--Nunavut--Baffin Island; Submarine topography--Nunavut--Baffin Island; Geology, Structural--Nunavut--Baffin Island; Sea level--Nunavut--Baffin Island|
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