Can this aircraft wreckage be identified?
A plane should be able to be identified by the serial numbers of the various parts recovered at the crash scene.  The history of any part on a plane is documented extensively by the serial number.  The NTSB should be able to track down when the part was produced and who the part was delivered to.   As Tanner mentioned the NTSB should be contacted immediately and the wreckage should not be moved.  There are many plane crashes that have occurred many years in the past which have still not been found. You may have stumbled on a piece of history that could bring closure to a family who may have never known what happened to their loved one.