It looks like it might have burned to the waterline as I think there could be old charring inside the hull. It might also just be black sand or clay sediment. You can see where the rudder was attached but cant tell if it had a screw coming out of the stern as it either was a side wheeler or the screw section is under the sand. there are up right metal supports tword the ster which is in better shape than the bow section...I am sure some where there are records of what it could be as I possess a book that has the records of an atlantic fleet blockade section with some csn units mentioned.
other than that Ive got nothing.... but then again I am just musing and havent done any real research.....
Seamus

Cogito sumere potum alterum

Protection Sought for Remains of Shipwreck Uncovered by Ike

A mystery ship uncovered over the decades following storms appears to be a Civil War schooner run aground in 1862 while trying to sneak past the U.S. Navy to enter Mobile Bay, according to one local expert. The ship reappeared earlier this month after waves created by Hurricane Ike eroded the beach about six miles from Fort Morgan. After examining photographs of the wreck, Shea McLean, marine archaeologist with the Museum of Mobile, said the ship is most likely the Monticello, a two-masted schooner run aground and partially burned on June 26, 1862. (Offsite: Mobile AL Press-Register)

Cogito sumere potum alterum