The book The Geology of Worcester, Massachusetts was written by author Perry, Joseph H. (Joseph Hartshorn), B. 1858 Here you can read free online of The Geology of Worcester, Massachusetts book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Geology of Worcester, Massachusetts a good or bad book?
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Under these conditions the hard, brittle, solid rock substance became as yielding as clay on the potter's wheel — plia- ble, flexible, bending into folds innumerable without the mixing or mingling of band with band. Sometimes this folding took place as the result of the intrusion of the granite, for the schist laminae were forced out of position and folded around the granite mass. More frequently granite sheets and schist laminae were crumpled together into a series of beautiful and minute fold...s. The latter foldirg njust have taken place after the granite was in place; and the granite offered no more resistance than did the schist. It is an interesting problem, geologically, to de- Difflcuity termine, if possible, the thickness of the schists, ttiteknew o? *^^ from this the thickness of the original sedimen- theschiats. taries out of which these schists were formed. With- in the quarry this is easily done by simply measur- ing band after band, for everything is there uncovered. Such direct measurement is not possible when we deal with the forma- tion as a whole, because by far the larger part of the formation is covered by sands, gravels and till.
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