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Edge of a Continent

Glaciers, rifts and the remnants of old mountains have made shapes of regional scale in the northeast US and southernmost Canada. This view stretches from Ottawa to the northern edge of North Carolina. It shows how large are even the smallest of the Great Lakes, and marks well the fall line on the edge of the southern piedmont, where hydro-power was so important to industrial development. Swarms of drumlins are found in many areas of the upper middle part of the view, and ridges are shown to be much smoothed near to the largest Finger Lakes. Below them the rearrangement of drainages on the southern melt margin has unique character.

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