Before offering an utterly fantastic guess of it's use, how about some more details not possible from the pic.
Was it a surface find or actually dug out of soil producing other artifacts??
Is that the skull attatch area just east of the fork??
Can you tell if its a natural Y buck growth or has it been definetly shaped [worked]
Does it have any age "look and feel" to it, like from March 2005 and rodent nibbled ??

is there any sign of scraping in the y? possibly a shaft straightner????

Thats what I thought Larry. I saw the fork and where they come together looks rounded as if it were a shaft straightener or final smoothing.