File:Central Connecticut in the geologic past (1915) (14580762037).jpg

Identifier: centralconnectic00barr (find matches)
Title: Central Connecticut in the geologic past
Year: 1915 (1910s)
Authors: Barrell, Joseph, 1869-
Subjects: Geology
Publisher: Hartford, Printed for the State Geological and Natural History Survey
Contributing Library: Wellesley College Library
Digitizing Sponsor: Boston Library Consortium Member Libraries

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cycle toward comple-tion is, therefore, a measure of the relative length of a part or allof the interglacial stages of the Quaternary period, rather than aproduct of post-Quaternary time. But the uplift has been so smalland the erosion of the rock last raised above sea level is so littleadvanced that the results cannot be given expression upon thestructure section. The importance of noting its occurrence liesin pointing out the relative insignificance of recent erosion, andin emphasizing the fact that all the features shown in the drawingare the impress of earlier geological periods, not of that in whichwe live. Connecticut during the Glacial Period, Figure 3. — The con-tinental ice sheet reached as far south as Long Island, and buriedall the hills of Connecticut, as well as the Catskill, Green, andWhite Mountains. From various lines of evidence, its thicknessover the Central Lowland on this section line, when at its maxi-mum, may be estimated as approximately a half-mile. It was an
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STRUCTURE SECTIONS of CENTRAL CONNECTICUTLat. 41° 35 N. NO. 23.) CENTRAL CONNECTICUT IN THE GEOLOGIC PAST. 23 unbroken desert of ice mantling the northern half of the continent,similar to the present ice caps of Greenland and Antarctica, andattaining a thickness of at least two miles in its central portions;a desert whose icy floor was in slow but perpetual motion towardits margin, while its surface snows, like the dusts of tropicaldeserts, were hurtled outward more rapidly than the solid icebelow by the freezing winds which at, short intervals blew fromthe interior. The ice removed the original soil and ground off acertain amount of rock, but did not remodel the landscape; itleft the landscape in all its larger features essentially as it foundit, a surface shaped by subaerial decay and running water. Uponthe final retreat, however, a disordered mantle of glacial wastewas left upon the rock floor. The hollows were marked by lakesand swamps; the river valleys were choked with sand and

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