Boulder with dagger carving

[TheRealDeal!]

I found a boulder with a carving of a curved dagger. the rock is about 3 ft tall by 4ft wide at the bottom. There are some horizontal straight lines across the bottom
.I am going to make a rubbing to show more detail on paper with measurements. If any one has info or ideas Id like to hear.
Yes I am going to detect the area. It is in the central Ca foothills. Its definitely aged as I scratched some other rocks nearby for comparison.
Ill try to reply as best I can. Thanks ahead of time.

 

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[Digger RJ]

Interesting!!! Keep Us posted

 

[Wildcat1750]

Very mysterious!...