CGRG Bibliography of Canadian Geomorphology
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Author : Cumming, E.H.; Aksu, A.E.; and Mudie. P.J.
Date : 1992
Title : Late Quaternary glacial and sedimentary history of Bonavista Bay, northeast Newfoundland
Publication : Canadian Journal of Earth Sciences
Issue : 29(2):
Page(s) : 222-235
Abstract
High-resolution seismic profiles and core data from Bonavista Bay, northeast Newfoundland, show that the sedimentary package above acoustic basement was deposited during the deglaciation of the Late Wisconsinan ice sheet. During the Late Wisconsinan maximum (approximately 20 000 BP), Bonavista Bay was occupied by a grounded ice sheet that extended farther offshore. Deglaciation of the bay was rapid and occurred prior to approximately 13 500 BP during a time of rising sea level. A basal till was deposited beneath the grounded ice, and after lift-off an ice shelf developed over the outer basins where diamicton was deposited. The inner bay gradually deglaciated as the ice margin retreated to the present-day shoreline by approximately 13 000 BP, and fine-grained outwash sediments transported by interflows were rapidly deposited. The inner bay remained under the influence of one or more remnant ice centres until approximately 10 000 BP, with ice positioned on the Bonavista and Gander peninsulas. Normal marine conditions were established in the outer bay by approximately 13 500 BP and in the inner bay and fjords by approximately 10 000 BP.
Bibliography of Canadian Geomorphology