Glacial geology of the Genesee River
Open-knowledge reference entry
The Genesee River flows northward from its source in northern Pennsylvania to enter Lake Ontario at Rochester, New York.
The present river valley has been modified extensively from preglacial river valleys. A lobe of the last glacier (Wisconsonian) pushed southward almost to the Pennsylvania line, dramatically reshaping the drainage patterns of central and western New York.
Middle Genesee
The first image shows the evidence of the glacial rerouting for the middle section of the Genesee. The original river had two branches. The east branch runs southeast of Mount Morris. It was much larger than the west branch, flowing from near present-day Canisteo, New York to empty into the preglacial Ontario River (now lake) north of Rochester. The headwaters of the east branch were blocked and diverted southward into the present Susquehanna River system by huge glacial terminal moraines just south of Dansville. The entire old valley was buried in that area. This left only the small Canaseraga Creek, to flow in the remnant of the large ancient east branch valley from Dansville to Mount Morris.
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