Geoscience Reference
In-Depth Information
Figure 9-17.
Extent of proglacial lakes (gray) in the central and eastern portions of North America during the
retreating phase of the late Wisconsin glaciation, maximum limit of late Wisconsin glaciation, and major drainage
routes (arrows). Asterisk (*) indicates location of Conneaut spillway (next i gure). Marine areas not shown; adapted
from Teller (1987, Fig. 2).
Figure 9-18.
Conneaut Marsh is among the largest marshes in the state of Pennsylvania, United States. It is situated
in a glacial spillway valley that carried melt water south of Lake Erie during the i nal phase of the last glaciation of
the region (Van Diver 1990). A drainage ditch runs along the center of the marsh; location shown in previous
i gure. Superwide-angle view toward northwest; blimp aerial photograph by J.S. Aber and S.W. Aber.
