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Up-turned grinding stone. This boulder was dislodg...
Id# 105938940, 346 x 500px
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By Adam Stackhouse
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
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 18 of 75
Avg Score   5.0 from 3 votes
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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
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