CGRG Bibliography of Canadian Geomorphology
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Author : Brigham, J.K.
Date : 1983
Title : Stratigraphy, amino acid geochronology, and correlation of Quaternary sea level and glacial events, Broughton Island, Arctic Canada
Publication : Canadian Journal of Earth Sciences
Issue : 20(4):
Page(s) : 577-598
Abstract
Raised marine and glaciomarine terraces on Broughton Island record regional isostatic adjustments and eustatic sea-level changes. Previous workers proposed three alternative glacial and sea-level chronologies of the region. These conflicts are resolved by the stratigraphic control provided by amino acid ratios (D-allo-isoleucine/L-isoleucine) in marine molluscs collected form cliff exposures. Amino acid ratios, radiometric dates, and relative weathering measurements on geomorphological features provide a basis for regional correlations. Based upon amino acid ratios, the coastal sedimentary sequences, all part of the Broughton Island Formation, can be subdivided into six units to which informal member names have been assigned. These units delimit at least four glacial episodes during which local ice advanced around Broughton Island to the outer coast. The youngest advance is correlative with deposits that are dated >54,000 BP, and the absolute ages of older events have been estimated from minimum uranium-series dates and amino acid data. Glacial events previously recognized as the Foxe Glaciation represent a much greater portion of the Quaternary than was previously realized.
Bibliography of Canadian Geomorphology