Bulletin - New York State Museum . ntain wherethe drift is very thick particularly opposite the notches openingnorthward through the mountain. The ice pressing against thenorthern side of these elevations appears to have pressed throughthe valleys and built up a shelving terrace of interstratified tilland washed gravels on which the tongues of the glacier at timesrested. From the evidence of heavy deltas between Dannemoraand Lake Champlain there appears to have been standing waterin this embayment; at levels above that of the main body of waterwhich later lay in front of the ice over the Champ
Bulletin - New York State Museum . ntain wherethe drift is very thick particularly opposite the notches openingnorthward through the mountain. The ice pressing against thenorthern side of these elevations appears to have pressed throughthe valleys and built up a shelving terrace of interstratified tilland washed gravels on which the tongues of the glacier at timesrested. From the evidence of heavy deltas between Dannemoraand Lake Champlain there appears to have been standing waterin this embayment; at levels above that of the main body of waterwhich later lay in front of the ice over the Champlain valleyj)roi)er. Such is the delta at Cadyville on the Saranac. Moraines north, east and west of Rand hill. Rand hill asshown in the rej)ort on the Mooers area [N. Y. State S3] is encircled with lines of retreatal moraine on the east,north and west \sco pi. 17]. These moraines with the exception ofa lower grouj) to be more particularly mentioned show no signsof wave action or of attendant outwash plains constructed in. I ANCIENT WATER LEVELS OP CHAMPLAIN-HUDSON VALLEYS 161j standing water. Between the lowest of this group of frontaldeposits on the north and ,the higher ones there intervenes theremarkable flat rock areas or spillways of Altona extendinginto the region northwestward as far as the internationial boun-dary at Covey hill, Canada. Flat Rock spillioays [see pi. 18]. These bared surfaces of thePotsdam sandstone mark the path of a torrential discharge ofwater held on the northern slope of the mountains along a linefrom the notch at the Gulf [see pi. 25] on the internationalboundary line to a point wesit of the village of West Ghazy, a dis-tance of about 19 miles. It is necessary to suppose that the icefront lay along the lower side of this spillway belt, which thusbecomes quite as definite as a frontal moraine in the fixationof the position of the ice at this time. This line of evidence isconfirmed by the occurrence of strong frontal deposits along thelower
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
