Bulletin - New York State Museum . nd sands, the summit of which did not rise abovethe 200 foot line. These coarse cobblestones are doubtless to beattributed to deposition by streams from the melting ice andtherefore may be referred to an earlier epoch than that of thecla3s and sands. We return now to the glacial deposits underlying the clays. Mcadoicdale stage. About 1 mile south of Meadowdale on thewestern border of the Albany quadrangle there is a local morainaldeposit with knobs and basins partly till and partly washedglacial drift the stratified components taking on a terraced forml)etwee
Bulletin - New York State Museum . nd sands, the summit of which did not rise abovethe 200 foot line. These coarse cobblestones are doubtless to beattributed to deposition by streams from the melting ice andtherefore may be referred to an earlier epoch than that of thecla3s and sands. We return now to the glacial deposits underlying the clays. Mcadoicdale stage. About 1 mile south of Meadowdale on thewestern border of the Albany quadrangle there is a local morainaldeposit with knobs and basins partly till and partly washedglacial drift the stratified components taking on a terraced forml)etween the 280 and the 400 foot contour lines. Deposition evi-dently took place in the presence of the glacier immediately afterthe retreat of the ice from the New Salem lake barrier. Thismoraine or kame moraine merges eastward into a broad sandplain at alyout the 300 foot level. Kanies and ridges of gravel out-line its margin on the north. Across a depression on the eastof it another small i>lain has developed at about the 240 foot. -2 X3 o bJD bfi m ANCIENT WATER LEVELS OP CHAMPLAIN-HUDSON VALLEYS 129 level. These three deposits are traversed by the road from Voor-heesville to Meadowdale. This falling off in the level of terrace and sand plain buildingfrom west to east, from 380 to 3G0 and then to 340 feet indicatesa lowering of the water level dependent on the opening of lowergaps between the ice front and the escarpment on the east. Theselevels of construction so like the effects of ice-confined waters arewithin the zone of altitude affected by ice on the east bank of theHudson in the Schodack district and lie above the broad clayplains immediately west and south of Albany and are thus clearlyabove any marine limit which has left a mark in this field. At South Bethlehem the upper level of these Albany clays is 200feet, near Voorheesville it is about 300 feet; in the dunes south ofSchenectady the hight is about 360 feet, the precise elevationhaving been affected by the erosion
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
