Hi again;
OK, call me cracked, but it looks to be flattened from side to side, right? Some memory from the deepest, darkest, recesses of the brain (a scary place, to be sure) says that that object is the claw from the extinct giant ground sloth.
Did you find it in a swampy area? Swamp water has remarkable preservative abilities; just look up 'bog bodies' on the 'Net.
Michbob
OK, that does sound cracked. I very nearly deleted this entry, so don't laugh.--Bob