Awesome shots!!
My wife found a black shark tooth on a beach just north of Jacksonville, Florida. It isn't quite that large, maybe a bit over an inch top to bottom. I did some research and came away with it being a very old Macko shark tooth, maybe 10,000 years.
Where did you find the Megladon tooth?
I have exactly three shark teeth in my collection, and one set of jaws for maybe a 6'.
Boo