The book A General Report On the Physiography of Maryland was written by author Cleveland Abbe Here you can read free online of A General Report On the Physiography of Maryland book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A General Report On the Physiography of Maryland a good or bad book?
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170 A EEPORT ON THE PHYSIOGRAPHY OF MARYLAND plained by superimposition from the cover of Potomac clays and gravels. Beyond the limits of the Middle Atlantic Slope one or two im- portant river studies have been executed which have some bearing on the Maryland problems. In 1890 E. S. Tarr' reported cases of streams in Texas which Avere superimposed from Cretaceous iipon Paleozoic rocks; and H. B. Kummel,' a year later, suggested that the eastward deflection of the Connecticut at Middletown, wher...e it leaves the yielding Triassic rocks and cuts a gorge in the crystallines, might be due to superimposition from the extended Cretaceous cover. THE PROBLEM PRESENTED. The observations of A. Keith, W J McGee, and others have shown that the gently rolling upland surface of the Piedmont Plateau is a continuation of the Schooley peneplain of N"ew Jersey and Penn- sylvania. The conditions of formation of a peneplain, or even of a district well advanced in topographic maturity, carry Avith them the expectation of finding the streams well adjusted to the underlying structure.
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