Miocene.

The largest deposits of phosphate rock in the country are found in Florida.

The geological foundation of Florida is far older than its surface sediments suggest. Its basement rocks, composed of ancient metamorphic and igneous rock, date back over 500 million years when they were a part of the supercontinent Gondwana. Through tectonic activities, the rocks migrated into Pangea and subsequently into the construction of the Florida peninsula during break-up of the supercontinent in

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