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Up-turned grinding stone. This boulder was dislodged and turned to a vertical position during the flood of 1996. <br />It's along the Merced River in El Portal. <br />Photo by Blitzo.

Id# 105938940,  Dimensions: 346 x 500 

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By Adam Stackhouse
Administrator
Mar 31, 2007

Quite clearly the biggest portable found yet!

By Coeus
From: a botched genetics experiment
Feb 10, 2011

I believe that this is the traditional beginnings of manufacturing on boulders.

By Morgan Patterson
Administrator
Jun 5, 2013

This isn't just erosion? How does one tell the difference between water formed holes like this and ones made by man?

Photo 16 of 69
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Up-turned grinding stone. This boulder was dislodged and turned to a vertical position during the flood of 1996.
It's along the Merced River in El Portal.
Photo by Blitzo.

Submitted By: Blitzo on Mar 31, 2007