File:Guide leaflet (1901) (14764950384).jpg

Identifier: scienceguide4660amer (find matches)
Title: Guide leaflet
Year: 1901 (1900s)
Authors: American Museum of Natural History
Subjects: American Museum of Natural History Natural history
Publisher: New York : The Museum
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: IMLS / LSTA / METRO

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d. The present upper submarine channel of the Hudson, whichhas a depth at its outer end of 350 feet, suggests that the land must havebeen elevated to that extent during the Vineyard interval. $ I There are no erosion channels referable to Wisconsin or post-Wisconsin elevation on Long Island. The upper end of the Hudsonchannel, however, between Sandy Hook and Rockaway Beach, has beenobliterated in part by Wisconsin outwash and in part by the shifting ofthe sands by the littoral currents that now sweep along the coast. ADVANCE AND RETREAT OF THE ICE OF THE LAST GLACIATION ■>> . An examination of the maps pages 4, 25, will show that the southern-most point reached by the ice of the last glaciation was Princes Bay,Staten Island, and Perth Amboy, New Jersey. The terminal moraine,which indicates the southern limit of glaciation, is not only well-developedat Perth Amboy, but it extends northeastward across Staten Island andLong Island, and northwestward through Summit and Morristown,
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VARVED CLAY FROM THREE GLACIAL LAKE BEDS NEAR NEW YORK CITYThe thick dark bands denote the winter accumulation; the intervening lighter oolored layers represent the summer deposition. A pin at the upper edge nl each of the dark winter bands marks the limits of each varvc. The distance between pins thus represents a verve, or annual deposit Section No. 34 eontains eighteen varvea deposited in glacial Lake Passaic one haU mile north ol MountainView, New Jersey. An offset hi the layers near the rinht margin represents a fault: the joining ol two dark winterbands in (lie upper right of the section is due to a lateral slide Section No 422 is a bottom sample taken from clay deposited in Lake Haokensaok, on.- mile north of LittleFerry, New .ier-e% The bottom i at \ c 1086), which rests upon the glacial ilrft or till, has been disturbed by aslide. The numbers with negative sign represent the authors count of the varves below a datum plane for the LittleKerry district, described in American Mu

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