Identifier: marylandgeologic03mary (find matches)
Title: Maryland geological survey
Year: 1901 (1900s)
Authors: Maryland Geological Survey
Subjects: Geology Paleontology Geology, Stratigraphic
Publisher: Baltimore, The Johns Hopkins Press
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

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n of the various formations, andalthough this line of evidence has been used whenever available, it hasbeen found more helpful to employ the criteria of topography than thatof paleontology. This is correlation by what McGee has called themethod of homogeny. Prom the bottom to the top of the Coastal Plain deposits of Maryland,the formations are separated by a large number of unconformities.Studies which have been prosecuted by those who have worked in thisregion have shown that the eastern border of North America has beenalternately below water receiving deposits and above sea level undergoingerosion. This uneasiness of the sea margin exhibited throughout Meso-zoic and early Cenozoic time is still more manifest and striking throughlater Cenozoic and Kecent time. Among the most interesting discoverieswhich have come to light in prosecuting the work on the surficial depositsis the undoubted oscillations of the land border. These results have animportant bearing on the theory of isostasy.
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maryland geological survey 25 Historical Eeview. During the summer of 1G08, nearly three hundred years ago, CaptainJohn Smith made his memorable voyage of discovery in Chesapeake Bay.Of the long line of adventurers, explorers, and geologists who havetraversed this region in search of information, he was the first. It iswith great interest, then, that we turn to Smiths narrative for the earliestpublished observations on the Coastal Plain of Maryland. The mountains are of divers natures: for at the head of the Baythe rockes are of a composition like Mill stones. Some of Marble, &c.And many peeces like Christall we found, as throwne downe by waterfrom those mountaines. For in Winter they are covered with muchsnow, and when it dissolveth the waters fall with such violence, that itcauseth great inundations in some narro valleys, which is scarce per-ceived being once in the rivers. These waters wash from the rocks suchglitering tinctures, that the ground in some places seemeth as guilde

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