The physical geography of New York state . Fio. 100. A sink hole in the region of Krutm-ky. mon in places, few have been discovered in New are illustrations of this class of basin nearSprings on the shore of Lake LAKES Dri-: TO ACCIDENT. — One of the nio-i cways in which river slopes have been locally changed tobasins is by the development of a dam across a river 200 The Physical Geography of New York State. course. dams are com-monly due tosome accidentby which thenormal devel-opment of theriver has instance,the early set-tlers of NewYork foundhundreds
The physical geography of New York state . Fio. 100. A sink hole in the region of Krutm-ky. mon in places, few have been discovered in New are illustrations of this class of basin nearSprings on the shore of Lake LAKES Dri-: TO ACCIDENT. — One of the nio-i cways in which river slopes have been locally changed tobasins is by the development of a dam across a river 200 The Physical Geography of New York State. course. dams are com-monly due tosome accidentby which thenormal devel-opment of theriver has instance,the early set-tlers of NewYork foundhundreds ofthese pondsand swampscaused by thedams thrownacross smallstreams bybeavers. Someof these stillexist, and inparts of thecontinent, asin Canada andthe RockyMountains,these interest-ing animals areeven at pre-sent buildingtheir dams. A landslide or an avalanche may obstruct a streamcourse and transform it to a lake. Among lofty mountains,as in the Alps or Himalayas, vast dams of fallen rock haveformed good-sized lakes, and in New York there are alsoinstances of the same kind of basin, though very much FIG. 107. Ponds in sink-holes near Dodge City, Kansas(United States Geological Survey, Dodge sheet). ys <ti«! Sin/in/** Many of the landslip dams of New York havebeen formed where a stream, eating at the base of a bankof glacial till, has caused a slide to occur, which has tem-porarily transformed the stream t
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