"1847" inscribed on granite obelisk which marked an end point of the baseline measured by Alexander Dallas Bache on Dauphin Island in 1847

“1847” inscribed on granite obelisk which marked an end point of the baseline measured by Alexander Dallas Bache on Dauphin Island in 1847. This granite marker is now in Ft. Gaines at the entrance to Mobile Bay. Although moved from its original location, it is the oldest known Coast Survey marker on the Gulf Coast.

Photo Location: Alabama, Dauphin Island