Bulletin - New York State Museum . mountainterrace arose, the terrace being the then bed of the river, andconsequently above sea level. Below and east of this terrace stretches another, a broad deltaterrace, meeting the base of the earlier deposit at an elevationof 400 feet and probably marking a further marginal retreat of<he ice sheet and a consequent lowering of the level of the glacialAdirondack-Hudson river [see fig. 20, p. 146]. Glen Lake kettle terrace. Small isolated terraces occur on theflanks of Luzerne mountain at the 500 foot and even higherlevels marking the recession of the ic
Bulletin - New York State Museum . mountainterrace arose, the terrace being the then bed of the river, andconsequently above sea level. Below and east of this terrace stretches another, a broad deltaterrace, meeting the base of the earlier deposit at an elevationof 400 feet and probably marking a further marginal retreat of<he ice sheet and a consequent lowering of the level of the glacialAdirondack-Hudson river [see fig. 20, p. 146]. Glen Lake kettle terrace. Small isolated terraces occur on theflanks of Luzerne mountain at the 500 foot and even higherlevels marking the recession of the ice from the eastern flanksof the Adirondacks south of Lake George. It is not necessaryto suj)pose that these deposits were ever much more continuousthan they are now but below them at the base of the mountainextends one of the broadest and heaviest though not the longestglacial terraces seen anywhere in the Hudson valley. Thisdeposit incloses Glen Lake, the central and largest example of SOUTHERN THIRD OF THE GLENS FALLS QUADRANGLE. The geolojrfcally c olored ar as show s ccessive stages of the eat of the ice-shee t from Pa Imenown mountain and of the adju entof the Adlrond ack Hudso n river tot he country freed by the 1 THE REGION ABOUT FOET EDWARD. Cotiloiir inleiTsd 20 , ia mnan sea U\-el. The remarkable trough from Fort Edward to the northeastern cor-ner of the map extends the Hudson gorge into the Champlaln trough,not so deep, Is shown two miles east of Fort Edwar^.These troughs served as outlets to Lake Vermont. ANCIENT WATER LEVELS OF CHAMPLAIN-HUDSON VALLEYS 141 a group of deep ice block holes and kame kettles, the mostextensive in the entire length of the Hudson and Champlainvalleys. This terrace begins on the south near the Hudsonriver in a narrow shelving deposit having an elevation accord-ing to the contoured map of about 420 feet. Two miles northof the Hudson river, the terrace or at least a higher level ofthe deposit attains an elevation o
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
