Wreckage from a ship found during excavation at the World Trade Center site is believed to be from the late 1700s.
Archaeologists from Columbia University have tentatively identified the boat as the Hudson River Sloop.
Wood from the ship appears to have been chopped down from a Philadelphia forest in 1773.
They say the ship was designed by the Dutch, and likely carried passengers and cargo for 20 to 30 years before coming to rest a block west of Greenwich Street.
The scientists believe the ship's remains would have vanished completey if the September 11 terror attacks had not encouraged re-birth of the site.
The curved wood was originally spotted poking out of the mud by workers four years ago.
For now, the wreckage rests inside the Maryland Archaeological Conservation Laboratory, but it may eventually be reassembled.