MADISON (WKOW) -- Archaeologists say a wooden beam found on the floor of Lake Michigan wasn't attached to a larger ship, but they think it could be a detached piece of wreckage from the Griffin, a ship that disappeared while exploring the Great Lakes in the 17th Century.
The discovery of the 10-foot-long section of a beam prompted an expedition that started last week. A French archaeologist says it still appears the beam came from a ship.
The Griffin, commanded by the French explorer La Salle, disappeared in 1679.
Dive crews have been digging beside the timber for signs of the Griffin in mud below.
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