Late Quaternary Glacial and Vegetative History of the Glacier National Park Region, Montana

摘要

The report presents the late Quaternary glacial and vegetative history of the Glacier National Park region, northwestern Montana, based on field mapping, volcanic ash identification, radiocarbon age determinations, and tree-ring analysis. The report documents the presence of the three late Quaternary ashes in the Glacier National Park region and describes the stratigraphy at the sites of these ashes and (or) organic material on which radiocarbon age determinations were made. Next, the report discusses the implications of these ashes and radiocarbon ages to the late Quaternary history of the Glacier National Park region. In addition, the report documents the use of tree-ring analysis to date the minor glacial advance of the mid-19th century and subsequent recession.