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Dating the Mid-Holocene History and Glacial Stratigraphy of Wachusett Inlet, Glacier Bay National Park and Preserve, Southeast Alaska
Presented by Sarah APPLETON on 15 May 2013 from 18:00 to 21:00
Type: Poster Presentation
Session: Poster Session + Reception
Board #: 5
A 570-year floating tree-ring-width chronology was built from samples of in situ forests and detrital logs of 27 trees from a tributary valley of Wachusett Inlet in Glacier Bay National Park and Preserve. Calibrated radiocarbon dates provide absolute ages for the ring-width series and stratigraphic analyses show that the trees were killed by a series of ice advance-related sedimentation events at approximately 3,000 yr. BP. The ring-width chronology strongly crossdates with a ring-width series from Geikie Inlet, 30 km to the southwest, suggesting the ice expansion covered much of the mid-to-upper watershed at 3,000 yr. BP. The ice advance in Geikie Inlet occurred between 3,400-3,000 yr. BP after the advance in the tributary valley, which dates to 3,000-2,800 yr. BP. The coupled use of radiocarbon dating with tree-ring-width chronologies adds decadal resolution to the glacial chronology within Glacier Bay.
Room: Salon E