The Geography of the Region About Devils Lake And the Dallas of the Wisconsin
The Geography of the Region About Devils Lake And the Dallas of the Wisconsin
Rollin D Salisbury
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In tracing the moraine over the greater quartzite range, it is found to possess a unique feature in the form of a narrow but sharply defined ridge of drift, formed at the extreme margin of the ice at the time of its maximum advance. For fully eleven miles, with but one decided break, and two short stretches where its development is not strong, this unique marginal ridge separates the drift-cov- ered country on the one hand, from the driftless area on the other. In its course the ridge lies now ...on slopes, and now on summits, but in both situations preserves its identity. Where it rests on a plain, or nearly plain surface, its width at base varies from six to fifteen rods, and its average height is from twenty to thirty feet. Its crest is narrow, often no more than a single rod. Where it lies on a slope, it is asymmetrical in cross section (see Fig. 39), the shorter slope having a vertical FIG. -39. Diagrammatic cross-section of the marginal ridge as it occurs on the south slope of the Devil's Nose.
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