Which agents of erosion were primarily responsible for forming the long narrow U-shaped valleys in the finger lakes region of New York State?

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ncchemist | eNotes Employee

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The term "Finger Lakes" describes a group of lakes in the western part of upstate New York.  They are a group of long, narrow lakes that roughly resemble fingers that lie south of Lake Ontario.  They run mostly north-south and area among the deepest lakes in the US.  The deepness of these lakes is the main clue to how they were formed; they were formed through glacial erosion.  A glacier in the Pleistocene era moved southward and deepened a series of river channels.  Debris left behind by the glacier caused the water to dam and the Finger Lakes were ultimately formed.