On the postglacial history of the Hudson River valley

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Abstract
FRo}I the post-Glacial deposits in the Hudson River valley may be derived much information as to the conditions prevailing therein subsequent to the retreat from its vicinity of the continental glacier.These qeposits are of two general types: estuary formations of stratified clay and fine sand deposited in still water, and cross-bedded delta deposits of coarser material.They fringe the river shores in terraces between New York and Albany and indicate a long period of submergence, their present altitude above tide showing that the land has been elevated with respect to sea-level since their formation.Their materials were apparently brought into the estuary by tl'ibutary streams which dropped the coarser particles neal' their mouths, while the finer rock flour was carried on in a state of suspension, and was finally precipitated to form beds of clay.From Albany westward spreads an alluvial formation which attains at Schenectady an altitude of about 340 feet a-ad extends through the Mohawk Valley in terraces which rise in altitude till they merge in the elevated beach plain of Lake Ontario at Rome about 405 feet above tide level.The origin of these terraces has not yet been determined.According to Mr. G. K. Gilbert the raised beach at Rome is that of a lake dammed by ice in the St. Lawrence Valley and flowing out into the Mohawk Valley, which carries its drainage into the Hudson estuary.According to this view the alluvial plain at Schenec-
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Authors F. J. H. Merrill
Journal american journal of science
Year 1891
DOI
10.2475/ajs.s3-41.246.460
URL
https://doi.org/10.2475/ajs.s3-41.246.460
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