If an effigy what is it and are there like examples and is the other side worked? Here is a busted what I think to be a pop eye bird stone. But as it is broken and unfinished and I will never know.
Is it made of sandstone? The pattern on the slab that seems to form an eye reminds me of the appearance of concretions in clay. I don't know if the slab itself was ground into shape, but the pattern on top may have started out natural:
I really need a better pic to say either way. I got glasses on and it still looks blurry. Lets see some better pictures maybe take them outside. I really would like to see it.
I realize I have not shown my degree on lithography, but trust me that it is ground/pecked hard stone. It is not clay. If it was clay I would have probably noticed it somehow. And tomorrow I will put up the Nikon on the tripod I use to do images for my database and shoot real images. But it is a chipped face. The first time I thought duck, but it might be a bear. It has the feeling of a shaman piece. They feel different to me. It might me my imagination, but imagination is all we see around us anyway