Moss Island

On Moss Island on the Mohawk River in Little Falls, NY. While the falls on this section of river are small in present times, this area was the location of an ice dam formed by a glacier 16,000 years ago. When the ice melted it released a glacial lake the size of Lake Ontario cutting a deep channel into the granite bedrock all the way to the Hudson River. Moss Island is a patch of harder granite relative to the surrounding riverbed which has eroded down leaving the island high and dry. The surface depicted here was once the riverbed under fast moving water and the concave rounding of the rock walls in the photo are the weathered remnants of circular pits known as potholes ln the granite river bottom. Rocks and boulders entrained in the high velocity current nick dents in the riverbed interupting the flow and causing whirlpools to form underwater.  Smaller rocks get caught in the whirlpools and spin in tight circles over the initial gouge, drilling circular pits into the riverbed.

Copyright: Pete babij
Type: Spherical
Resolution: 29900x14950
Uploaded: 24/01/2013
Updated: 07/02/2013


Tags: bridge; river; water; riverbed; scenic; pothole; island; erosion
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