I'm in east Napa County, Ca.
Acorns were key to the culture here.
Old timers remember when these little valleys were littered with mortars but I guess they collected them all.
I doubt there are many left to find , at least out in the open, like this one was.
I've found two.
The first one (also found in a creek) is the bowl type and I wasn't certain that it actually is an artifact until I found this new one.
Initially I wasn't sure because the hole on the boulder (bowl type) is not fully developed.
Now I think it was abandoned before getting much use.
Even though the hopper mortar has a nice deep hole, it compares nicely with the other and I feel confident that the bowl is legit.
So, in a way, I got two for the price of one.
That's pretty great.