Florida’s Fossil Reef Park

A Short Story

Discovering Windley Key Fossil Reef Geological State Park

Over the past few decades when visiting the Florida Keys we would drive past a dirt road with a locked chain link fence on Windley Key in the upper Keys. A number of years ago the gate, while still locked, displayed a new sign that read “Windley Key Fossil Reef”. Today it is open to the public as a state park. On our recent Keys drive we stopped in and spent a couple of hours visiting the Visitors Center and hiking the park.

Windley Key Fossil Reef Geological State Park  is between mile markers 84 and 85.5, between Plantation Key and Upper Matecumbe Key.

If you’re planning a trip to the Florida Keys this often overlooked park is really worthy of a visit. Windley Key Fossil Reef Geological State Park provides an interesting exposure of a geological formation known as the Key Largo Limestone. This is a limestone rock fossil quarry; and the material is known locally as “keystone”. The entire quarry is comprised of a Pleistocene fossil reef, estimated between 100-125,000 years old. A majority of the keys are formed on this fossil reef system. The ocean levels rose and fell multiple times after the last Ice Age, and stabilized over the last 5,000 years. The top 25 feet of the old coral reef became exposed, died and laid the foundation to form Windley Key Fossil Reef .

Want to go exploring for fossils? Oddly one place to look is your nearest mall or new hotel or office building. On the floor of many of these places is polished limestone made mostly of calcium carbonate (CaCO3) in the form of the minerals calcite or aragonite, that contain an abundance of fossils or fossil traces. The fossils under your feet may be macroscopic or microscopic. The macroscopic fossils often include crinoid stems, brachiopods, gastropods, and the remains of other hard shelled mollusk. In Florida the main form are the remains of these ancient coral reefs.

So next time you’re in Florida, visit a coral reef without even getting wet.

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