it looks like something that has a uniform comb like design, i would assme this to be something like a sheetrock saw or blade off of a reciprocating saw.
is anyone in the area into construction or is there a construction job around your area?
:edit:
it could possibly have been a knife. but it looks pretty deep to me.
Last edited by sherwood; Jun 19, 2006 at 06:03 PM.