Bulletin - New York State Museum . the best preserved portion of theterrace, which in an east and west section shows the profile givenin the figure on i).117. In this section, the terrace presentsthe form of a glacial plain, deeply cut away on the outward orriver side, and bounded on the west by topographic features whichare distinctly due to the deposition of the materials in the pres-ence of ice in the valley of Quassaic (reek. The head or icew\ardmargin of the plain is slightly mounded as if by the pressure ofthe ice, and the slope into the valley on the west is cast in theform of kames and
Bulletin - New York State Museum . the best preserved portion of theterrace, which in an east and west section shows the profile givenin the figure on i).117. In this section, the terrace presentsthe form of a glacial plain, deeply cut away on the outward orriver side, and bounded on the west by topographic features whichare distinctly due to the deposition of the materials in the pres-ence of ice in the valley of Quassaic (reek. The head or icew\ardmargin of the plain is slightly mounded as if by the pressure ofthe ice, and the slope into the valley on the west is cast in theform of kames and mounds. In fact the country on the west andnorthwest as viewed from the terrace presents a field of kamesdrained by the Quassaic quite as distinctly contemporaneous withthe ice sheet ns those which liMve been described in the valleys ofthe Chenango and other streams.^ »Brlgham, A. P. Glacial Flood Deposits in Chenango Valley. Geol. Bui. LS97. 8:17-30. PART OF THE NEWBURG QUADRANGLE STATE MUSEUM BULLETIN 84. PLATE TERRACES BETWEEN NEWBURG AND CORNWALL Scale 62500 2 Miles Coil to ux ixiter\^ai 20 feet. Da;tiurh is iitectTL .tea. l&veZ . High levelterrace deposits. IceConta^tdeposits. 100-footTerrace. 60-footTerrace. ANCIENT WATER LEVELS OF CHAMPLAIN-HUDSON VALLEYS 117 The kame or ice contact slope of the terrace is strewn withangular stones up to 6 inches in diameter. A. block of limestonelies in the morainal belt near the railroad, also ice-scratchedpebbles and boulders up to 2 feet in diameter occur near the BayView terrace. The structure of the terrace shows that it is composed in partof clays and in part of sands and gravels. South of WashingtonsHeadquarters Museum the clays appear to rise not higher than 30feet above the river. Other points reveal a yellowish oxidized claytop in the plain with gravels in foreset beds beneath. On the south side of Quassaic creek well defined foreset beds ofgravel and sand form the principal part of the section down to ?^^-^
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
