CGRG Bibliography of Canadian Geomorphology
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Author : Barendregt, R.W.; Vincent, J-S.; Irving, E.; and Baker, J.
Date : 1997.
Title : A terrestrial record of climatic fluctuations during the Quaternary: Magneto- and Bio-lithostratigraphic evidence from Banks Island, Western Canadian Arctic Archipelago.
Publication : Beringia Paleoenvironments Workshop Sept., 1997: Abstracts and Program. Edited by: Scott Elias and Julie Brigham-Grette . Workshop sponsored by the U.S. National Science Foundation.
Issue :
Page(s) : 17.
Abstract
Sediments approximately 50 m thick from Banks Island (Western Canadian Arctic Archipelago), contain one of the longest terrestrial records of Pleistocene climate changes in North America. During the Matuyama Reversed Chron there are at least two and possibly as many as five full glaciations, two interglacial intervals, and a non-glacial interval at the beginning which is considered preglacial. Both of the normal Olduvai and Jaramillo subchrons within the reversed Matuyama appear to be present. During the Brunhes Normal Chron, three full glaciations and three interglaciations are recorded. The Brunhes-Matuyama boundary occurs within interglacial deposits, indicating that the geomagnetic field last reversed during an interglacial interval. Based on floral, faunal, stratigraphic, and paleomagnetic constraints, a normal sequence in the preglacial Worth Point Formation is assigned to the Olduvai normal polarity subchron (1.95-1.77 Ma). The Worth Point Formation records a climate milder than today, and cooler than that of the late Tertiary. The first direct evidence of glaciation on Banks Island, occurs in sediments that post-date the Worth Point Formation (< 1.77 Ma). This suggests that in the western Canadian Arctic, the first continental glaciation post-dated the first Cordilleran glaciation in North America by as much as 1.0 Ma.
Bibliography of Canadian Geomorphology