Could you tell if it had been on the rock for a long time, there should have been a build up of some dirt where it was sitting under it.Great finds and good eye.
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There really wasn't much dirt or soil under it, the large boulder it was on is limestone which is quite prevalent in the area. It is also possible that someone in recent history picked it up and laid it on the boulder and forgot it. If you magnify the picture in the circled area you can see that the lichen has built up on the surface of the mano.
Nice artifact finds OD. I wonder why here they chose to make theirs square and up north round (Mano)?
Nice finds Old digger.
Rock.. I'm sure there are different shaped ones by you. Round,square"ish" bell shaped,hoof shaped...some just a natural shaped stone used..it depends on what it was being used to prepare..what was being prepaid..how it was being prepared..what it was being prepaired on...if it was a tool being used for a long time in a village or shelter that would be returned to or just out during travel and camp use.
Think about it... Think about living and making your food and medicine.. These are just people with honed survival skills and passed down ways... Not aliens.
Not meant to be offensive at all..just kinda putting the way I learned out there.