It was found in Erie PA. If you can't tell from the picture the acorn is about 1 3/4 inch long and the cap is small and very hairy. I didn't look at the actual tree itself, but I was told it resembled an english oak in shape.
The acorns look like Turkey Oak Quercus cerris. Pic isn't clear enough to tell if the leaves and twig match - can you get a sharper, higher resolution pic?