File:The geological history of the Connecticut Valley of Massachusetts - a popular account of its rocks and origin (1921) (14764961144).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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
'
Text Appearing After Image:
CoxxECTicuT Valley of Massachusetts 31 known, but also many details of the history covering late Triassictime are recorded with an amazing degree of perfection, some ofthese being pointed out below. We are now ready to consider the opening of the great Mesozoicera beginning with the Triassic period at least 8 or 10 million yearsago. During the first half or two-thirds of Triassic time vigorouserosion or cutting down of the mountainous lands took place incentral western Massachusetts. The thick, highly folded Paleozoicstrata and involved granites, during this time at least i or 2 millionyears long, slowly weathered and crumbled, and the loosenedmaterials were carried aw^ay by the streams. This process of erosionwent on until, by relatively late Triassic time, the strata were deeplycut into and worn down^ granite bodies were laid bare, and the prob-ably once existing volcanoes were completely eradicated. Thederived sediments were carried far away, probably into the AtlanticOcean. In any

Note About Images