. Glacial formations and drainage features of the Erie and Ohio basins. of 350 feet, and formingin its passage three falls of 66,100, and 96 feet, respectively. This channel is narrow,with mural banks; but a short distance below the lower falls it emerges into a broadervalley in a line with the channel to the south of Portage before it is deflected from itscourse. The space between these two points is a deep, broad gorge, filled to a greatheight with clay, sand, and gravel. This is evidently the ancient channel of the river,and 3et, after it had become filled with this drift, the stream found

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. Glacial formations and drainage features of the Erie and Ohio basins. of 350 feet, and formingin its passage three falls of 66, 100, and 96 feet, respectively. This channel is narrow, with mural banks; but a short distance below the lower falls it emerges into a broadervalley in a line with the channel to the south of Portage before it is deflected from itscourse. The space between these two points is a deep, broad gorge, filled to a greatheight with clay, sand, and gravel. This is evidently the ancient channel of the river, and 3et, after it had become filled with this drift, the stream found an easier passageby excavating the solid rock for 3 miles than by removing these loose materials. Still below this point the river leaves the broad channel and excavates a gorgethrough the shales, emerging into the broad vallej at Mount Morris. ^ It should be noted that the Genesee River has two western tributaries called Black Creek.The name Honeoye is also applied to two streams here discussed. 2 Geology Fourth Dist. of New York, by James Hall, 1843, pp. 344, 422.. .1 MIDDLE FALLS OF GENESEE RIVER AT I tjRTAuE, N