Heavily Pecked and Battered Pedestal

[IMAUDIGGER]

Heavily Pecked and Battered Pestle

(PESTLE) Wish I could edit title!

Found yesterday in Northern Ca.
Can anybody help with the correct terminology to describe this tool? Also wanted to share (it's my best find to date). Completely unsure of the possible age.

I think this is classified as a pestle, showing evidence of pecking and heavy battering on each end. It has a narrow chopping end and a broad mashing end. It has well defined thumb ledges as well as some not so noticeable contouring for the fingers. I believe it's made from greenstone? It must have been a very desirable stone for all the labor that was put into it.
I suspect it was used for a very long time.

Outward face (notice pecked thumb ledges)


Palm side


Chopping end


Mashing end


Chopping end down (thumb indexed in pecked ledge)


Mashing end down (thumb indexed in pecked ledge)


As rough and heavily battered the ends are, my first thought was that this was a hammerstone of some sort used for breaking cobble, not mashing up wood/nut/fibers.
It weighs just under 2.5 pounds!

Please correct me if this isn't classified as a pestle

Think I'm going to have to twist some arms to get my family to come help do some serious looking with me.

 

[IMAUDIGGER]

The context in which it was found is important.

Had this been found along the shores of a lake or river, or walking across a farmers field, I would not be confident.

 

[Fred250]

I just like to see people reminded a lot of this is opinion, even the experienced and knowledgeable cant agree.

 

[IMAUDIGGER]

I patted the rock down with a soapy sponge to get some of the clay out of the pores. It also took off some of the black coating.

This is as much as I want to clean it.
It does show that the material is a greenstone.
I think the rusty look was mainly due to dirt.