Show moat lines are sought of oldest fortification washington excavation within fort marion national monument the oldest fortification in the united unite d states at st augustine fla is in tended to locate the lines of a its tone moat the work has been approved by the national park service and is ex pecked to establish the lines of a moat believed to have extended from the city gates of st augus tine to castle san marcos which is now the fort marion monument thence westward to the sebastian river the project is in charge of the st augustine historical survey sponsored by the carnegie institution tut on of washington and local groups |