This was neglected by the archeaologists...because Rockefeller was going to have his little moneymaker. Follow the money.
Your comment caused me to research Rockefeller and possible connections. Are you saying that they put barriers up to the Jamestown excavations because they wanted Williamsburg in the spotlight? Interesting...
At the time Rockefeller developed Williamsburg, most historians thought that the original site of Jamestowne Fort had slipped into the river.