Abstract
Holocene ice advance in the West Arm of Glacier Bay, southeast Alaska, resulted in damming of a tributary, Muir Inlet. Glaciolacustrine sediments record two separate damming events, and radiocarbon dates place these at 2500 to 2000 and 1700 to 900 BP. A third advance is known to have culminated in deposition of an end moraine at the mouth of the Bay ca. 300 BP. Very sketchy evidence from the West Arm suggests initial advance may have begun there ca. 4500 BP. At the resolution afforded by geologic data, the three well-documented advances of the Glacier Bay Glacier are broadly synchronous with advances of the Brady Glacier and glaciers in the Wrangell-St. Elias mountains and Icy Bay Fiord. All of these advances appear to have resulted from climatic fluctuations in the coastal sector of southern Alaska. At least one fiord glacier in the region, Lituya Glacier, has advanced and retreated in a manner apparently independent of climate.
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