Late glacial ice margin fluctuations (~12.5-10.0 ¹⁴C KYR BP) in the Fraser lowland and adjacent Nooksack Valley, southwestern British Columbia, Canada and northwestern Washington, U.S.A. ...

• Main Author: Kovanen, Doris J.
• Format: Text
• Language: English
• Published: University of British Columbia 2009
• Subjects: North Atlantic
• Online Access: https://dx.doi.org/10.14288/1.0052472; https://doi.library.ubc.ca/10.14288/1.0052472

The last glacial/non-glacial transition has important implications for understanding how abrupt climate changes were transmitted throughout the Northern Hemisphere. The Younger Dryas cold period, for example, is believed to be linked to a reorganization of the thermohaline circulation in the North Atlantic Ocean. The late Wisconsin deglaciation of the Fraser Lowland (3500 km²) in southwestern British Columbia and northwestern Washington was reconstructed from multiple lines of evidence. Traditional mapping and field techniques were integrated with computer-generated digital images to visualize morphologic features. New terminal positions are recognized associated with fluctuations of a piedmont ice lobe that occupied the central Fraser Lowland during the late stages of the Fraser Glaciation. The start of deglaciation is recorded by glaciomarine and glaciofluvial sediments of the Fort Langley Formation (Everson Interstade). Marine shells from stony mud range in age from c. 12,500 to 11,400 ¹⁴C yr BP. Multiple ...