Figure from Visible examination of Siple Dome, West Antarctica, shallow cores

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Figure 1. Occurrence of melt layers in the Siple Dome cores, and in the Upstream C (UpC) core from ice stream C, arranged from south (top) to north (bottom); the WAISCORES identification code for each core (A-I and UpC) is indicated. Most melt layers were unequivocally identifiable and are shown with a vertical bar. Those that might have been mistaken for a crust (a thinner bubble-free feature that may arise from melt, wind packing, or other processes) are indicated by shorter bars. Dating is preliminary and based on visible-stratigraphic identification of summer layers by Penn State researchers. The bottom of each core is indicated by the thick, patterned line. In the case of Upstream C, the core continued below the patterned line shown, but layering was badly disturbed; we identify the onset of disturbance as approximately the time when ice stream C ceased moving rapidly.