The physical geography of New York state . evidently did inpreglacial times,it w o u 1 d haveentered SenecaLake and thencehave passednorthward, pro- FIG. 88. To show present and preglacial stream courses yirlprl the streamnear Cayuta Lake. occupying the Seneca valley flowed as the water now runs. Instead ofthis it now passes southward into the Atlantic through theSusquehamia. There are other changes near here. By examining theIthaca sheet of the U. S. Geological Survey (Fig. 41) itwill be noticed that a series of hills stretch across thevalley of Pony Hollow at the place which is now the divid
The physical geography of New York state . evidently did inpreglacial times,it w o u 1 d haveentered SenecaLake and thencehave passednorthward, pro- FIG. 88. To show present and preglacial stream courses yirlprl the streamnear Cayuta Lake. occupying the Seneca valley flowed as the water now runs. Instead ofthis it now passes southward into the Atlantic through theSusquehamia. There are other changes near here. By examining theIthaca sheet of the U. S. Geological Survey (Fig. 41) itwill be noticed that a series of hills stretch across thevalley of Pony Hollow at the place which is now the hills are a part of the terminal moraine (markedmoraine in Fig. 88) and their height has prevented thepostglacial streams in that vicinity from taking their pre-glacial courses. The real preglacial divide of the PonyHollow stream is near Newfield on one branch, and nearTrumbulPs Corners on the other. By the filling of tin-Pony Hollow valley the stream has lost fully half of itsvolume. This amount of \vater has been turned from the. 1 This :qi|H:ir* to lie an intcrirhiri;.! cut. Sec |>. 177. 172 The Physical Geography of New York State Seneca into the Caynga Valley. In addition to the morainefilling in the Pony Hollow Valley, there are also extensivedeposits of overwash material, which have transformedthe valley bottom to a broad overwash plain. Cayuta Lake and the Pony Hollow stream, in preglacialtimes larger than now, at present unite to form CayutaCreek, which flows southward to the Susquehanna. Themap (Fig. 41) shows the valley narrowing in the directionof flow of these streams until Cayuta Creek reaches anarrow gorge, south of which the valley again topographic evidence here, therefore, points to anothercase of reversal, the site of the gorge being a divide sim-ilar to that of Thomsons Gap in the Upper the topographic evidence points toward the westwardflow of this part of Cayuta Creek in preglacial times, whenit received tributaries f
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