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Coastal and Marine Geology Program > Geology and Human Activity in the Florida Keys

Geology and Human Activity in the Florida Keys

USGS Fact Sheet

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A. A massive head coral, Montastraea annularis, photographed in May 1961, is located in the center of a sand hole. The 10-centimeter-long stainless steel pins were part of a growth-rate study. The cinder block holds a tubular sediment trap.
A massive head coral, Montastraea annularis, photographed in May 1961.

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Coastal and Marine Geology Program > Geology and Human Activity in the Florida Keys
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