I was just looking at pics of Mickler's Landing and all the teeth they were finding. I'm afraid to show my wife and daughters.
Also recently read about Washington Oaks Gardens beach as well with it's sculptured coquina rocks piled along the beach.
Interesting read, but the author's speculation about the pine planks is off base. Coastal pine lumber of the time would have been old growth longleaf pine, which is comparable to oak in strength and density. It was (and is) highly desirable for planking. The fact that it could be had in long clear boards was an asset. Heart pine had a natural resistance to destructive marine organisms that were prevalent in southern waters.
Now why the builder alternated pine and oak planks? I have no idea.
If I has to speculate, I would say using pine was a cost cutting measure, just because it was so much more available, but shipbuilders being a conservative lot, enough oak was included to make it traditional.