I am helping a friend of mine clean up their yard and condense a bunch of stuff in prep for moving. I found, actually two of them and I am not sure where they came from. sorry about the indoor pics but at 4 am there was no light outside. I will reshoot them and repost the outside photos later today. i almost think that they are not ancient and that a friend of theirs may have knapped them last year during hunting season.
That is Obsidian and someone did a lot of knapping on them by the way the flake scares look, with some edge work also. From the photo it's hard to tell if they are the real deal, but Obsidian does get a frosted look to it after a long age of being exposed to the weather and elements. As Rock said daylight photos would help.