Late Quaternary glacier fluctuations at Lillooet, Diadem, and Berendon glaciers, Coast Mountains, British Columbia

Stratigraphic and paleobiological records indicate pre-Little Ice Age advances of Lillooet, Diadem, and Berendon glaciers in the Coast Mountains of British Columbia. Subdued lateral moraines ("outer moraines") lie outside the Little Ice Age limit of each of the three glaciers. At Lillooet Glacier, sediments in dug pits, cores collected from ponds dammed by the outer moraine, and sediments exposed in a composite lateral moraine indicate four periods of advance: prior to 6200 14C yr BP and probably during late-glacial time; during the Tiedemann Advance with a maximum about 2800 14C yr BP; during the late Holocene between 1500 and 1000 14C yr BP; and during the Little Ice Age. At Diadem Glacier, sediments overlying the outer moraine similarly indicate an advance prior to 6200 14C yr BP, likely during late-glacial time. The sediments further suggest warmer conditions during the early Holocene and landscape instability during the Little Ice Age. At Berendon Glacier, stratigraphic evidence suggests that the outer moraine is older than 3500 14C yr BP. (Abstract shortened by UMI.)...