Interesting Rock found in Paradise

Continued----- Large Boulder with 4 Mortar Holes and possibly Petroglyphs

Large Boulder with Mortar Hole and possibly Petroglyphs

Interesting Rocks in the area of the mortar rock

Big Boulder with Mortar holes

I was out walking and seen this big boulder next to a stream, I looked under boulder and seen a few mortar holes....I guess someone rolled the boulder down the hill sometime in the past and this is how it rests now.

Rocks along side a trail in Paradise Ca with Mortar holes

Rock near Mortar hole, possible a rock for preparing the acorn meal???