Freeze factor does not apply to Florida points,Harrison County is one of the more widely used flint across the Midwest and eastern united states. It is one of my favorites. I used to find a lot more Harrison County in the 80s and 90s than I do now. But then again once I search a field I tend not to find too many relics in the field in the same season, so those two points may be tied together.
Interesting enough, This flake scraper and another point found the same day, have flake area which appear under magnification to have what some may consider a flake that SHOULD have been removed due to the freeze, thaw, freeze thaw physical weathering.
This manner of weathering occurs when water continually seeps into cracks, freezes and expands, eventually breaking the rock apart.
Some use this as an indicator to determine if a relic is old or not, a basis for authentication.
I have read much about this and tend to agree to a point. However these two relics would indicate this "theory" also has its holes.