Sunday, October 4, 2015

Presque Isle Potholes

Jessica and I just returned from a trip to the western upper peninsula of Michigan where we camped at Porcupine Mountains Wilderness State Park and visited several waterfalls.  The first visit of our trip was not far from our campsite and was the famed "potholes" near the mouth of the Presque Isle River.  The potholes form where an eddy current continually swirls pebbles and sand grains in a circular path.  Over time, the scouring action of these materials wear away the softer shale, forming the potholes.  The potholes come in all sizes.  We saw several that were only inches across and others that were several feet across.  They certainly are fascinating and one could easily spend a lot of time starting at them as the water swirls around and around.  They are mesmerizing!

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