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HI00001 is the first archeological resource ever to be listed in Hillsborough County. It is the Thomas Mound, dating back perhaps 4,500 years. A 1952 Florida Geological Survey (8mb PDF) reports as many as 400 burials were found at the site.

Archeologists and historians have told us there is strong evidence that DeSoto landed at the mouth of the Little Manatee River in 1539 and had an encampment in the area of this site and had contact with Native Americans in this region.