Very Clever. You Just Need One More Clue!
Clues Can Be Found in the “Charles Town Bay” Dossier.
Well, you have arrived at a unique landmark on a muddy creek. It looks as though people have been digging holes in the area for centuries, so we can bet that no treasure is here. This seems to be a checkpoint to the next marker. You will likely need to travel in a single direction for a certain distance to get there. (Click the Google Map link and/or look at past documents for hints.)