Identifier: bulletinnewyork841905newy (find matches)
Title: Bulletin - New York State Museum
Year: 1887 (1880s)
Authors: New York State Museum New York State Museum
Subjects: Science
Publisher: Albany : New York State Education Dept
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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hedgravel and sand which extends beneath the swamp at the south-western end of the outer or southern ridge, sloping from about(JO feet at the edge of I lie moraine to 10 feet where it disappearssouthward beneath the iccent swamp accumulation, fixing theupi)er limit of the water body or lake inlo which it was builtas lower lliaii 10 feel at the time of this stage, bilt giving nocloser index of sea IcncI. The positi(Mi of these frontal moraines, just north of the Pier-mont gap, plainly indicates that at this time the gap was freefi-om ice, pr<*sninal)ly allowing tho oscai)e of the drainage as nowinlo (he Hudson gorge; nor does the Hudson river appear to have(lowed iliiMMigh I his gap since the ice last disappeared from itsvallry. .lust oast of the Sparkill station glacial striae on theliaj. lock ic;i(; II. Ll w. n direction aibout at right angles to theiiKnaiiic showing (hat, though the striae may have been made PART OF THE TARRYTOWN QUADRANGLE N. Y STATE MUSEUM BULLETIN 84. PLATE 2.
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THE TAPPAN RETREATAL MORAINES. Scale 62500 2)SGlef Coiitoxu? irLtei?\al 20 feet. DcUurrv is niecvn sea. level . Frontalmoraines. i ANCIENT WATER LEVELS OF CHAMPLAIN-HUDSON VALLEYS 95 before the moraines, when the ice ran to the south, the directionof ice motion had scarcely changed at this locality during theretreat from the terminal moraine. West of Tappan in New Jersey other frontal deposits similarin form to the morainal ridges at this place occur in the formof a crescent open on the north, indicating the position of the icefront at this stage in that direction. The extension of the ice front east of the Hudson at this stageis not clearly shown by any facts now at hand. The moraines at Tappan N. Y. and in Harrington N. J. appearby their alinement to be synchronous deposits. The water-laiddrift confronting the Tappan deposits rises to 60 feet above sealevel, but the plains confronting the Harrington deposit appearto rise to 100 feet. It is evident that these slopes of washeddrift we

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