[Base for ovens  in bakery]

The ovens in the bakery were supported by a concrete base. Take a look at the sides of this base and you'll see thousands of sea shells in the concrete. When Fort De Soto was being constructed, they had no aggregate (gravel) for the concrete mix. So they substituted sea shells--with great success!

[Sea shells were  used in place of aggregate in concrete mix]
 
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