File:The geological history of the Connecticut Valley of Massachusetts - a popular account of its rocks and origin (1921) (14580868177).jpg

Identifier: geologicalhistor00mill (find matches)
Title: The geological history of the Connecticut Valley of Massachusetts : a popular account of its rocks and origin
Year: 1921 (1920s)
Authors: Miller, William J. (William John), 1880-1965
Subjects: Geology Geology
Publisher: (Northampton, Mass. : The Hampshire Bookshop)
Contributing Library: Wellesley College Library
Digitizing Sponsor: Boston Library Consortium Member Libraries

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es. The side cutting due to the meandering of the river greatlyaided in the development of the broad valley floor on the Triassicstrata, while the hard lavas stood out boldly against the lateral plan-ation process. This broad valley floor was really a local peneplain(see figure 2t). That the country was essentially in the condition above de-scribed just before the Ice Age is clearly proved by the fact thatGlacial and Postglacial deposits are not only very widespread as amantle over the floor of the Connecticut Valley today, but also innearly all the valleys of the highlands on each side. The evidence 58 The Geological History of the is overwhelming that the vast glacier of the Ice Age did not carveout the main existing relief features of the region. To be sure theice did some work of scouring but not enough to greatly alter theface of the land. In the very short time since the Ice Age the streamshave only fairly started to remove the Glacial and Postglacial de-posits from the valleys.
Text Appearing After Image:
FTG. 21. NTEW NOXTHSASnS AaO ACROSS THE CDVXECTICLT VaLLET FROM A HTLL OXE-H.\LF OF AMILE WEST OF NORTH HATFIELD. THE RE3ilARKABLY FLAT VALLEY FLOOR IS HERE FFV-E MILES WIDESOL-TH .\XD NORTH SLGARLOAF MOL-XTATSS IN THE LEFT DISTANCE. .OCD MOL-NT TOBY IN THE RIGHTDI5T.\NCE. PHOTOGRAPHED BY THE ALTHOR. Before passing to a discussion of the great Ice Age and itseffects, another disturbance of the earths crust must be considered.Atter the Tertiary erosion had proceeded far enough to dissect thehard crystalline rocks of the upraised peneplain into the hilly countrymuch as it is today, and to cut down the weaker Triassic strata intothe broad flat-bottomed valley near sea level, another broad upliftof the region took place. The whole northern Atlantic Coast areawas in fact affected by this uplift which occurred not long before theIce Age and the land then stood notably higher than at presentwith the seashore considerably farther out. The larger rivers, likethe Hudson and Connecticut, were es

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