Windley Key Fossil Reef Geological State Park in Islamorada preserves an old limestone quarry where fossilized coral is visible in the rock. Follow the walking trails through shaded hardwood hammock and look closely at the quarry walls for cross-sections of the ancient reef. The site also tells the story of stone taken from the quarry for Henry Flagler’s Overseas Railroad. Pick up a numbered guide at the ranger station or join a guided walk to learn more about the geology and the quarry’s past.
A quarry cut into an ancient reef
The rock at Windley Key is Key Largo limestone, formed from fossilized coral. Quarrying exposed the reef’s structure, leaving walls where you can examine cross-sections of coral and other ancient marine life. It is an unusual chance to see reef material above the water’s surface, preserved in the stone rather than living in the sea.
The quarry produced a decorative building stone known as Keystone. Its rock was used in construction around the Keys and supplied material for Henry Flagler’s Overseas Railroad. The quarry remained in use into the 1960s. Look for old machinery around the grounds, which helps connect the exposed rock to the site’s industrial history.
Trails through the hammock
Five self-guided trails take you through the quarry and the surrounding hardwood hammock. The paths are described as easy to walk, and the shaded route passes native plants and trees. Interpretive signs identify vegetation along the way, including both native and invasive species.
At the ranger station, you can pick up a guidebook with numbered stops. Use it to follow the trails and learn about the geology and the quarry’s past as you go. Guided tours are another way to explore; check with the park about what is available during your visit. The Alison Fahrer Education Center is a reference point for trail access, and educational exhibits add context to the walk.
Planning your visit
The park is at 84900 Overseas Highway in Islamorada, near mile marker 84.9. You can make the visit a short walk or take longer to follow several paths, read the interpretive signs and examine the quarry walls. Picnic tables provide a place to pause during the visit.
Wildlife can appear along the trails. Iguanas are among the animals you may see, and early morning is a good time to look for them in sunny spots. Give wildlife room and avoid disturbing animals. The park is a history and geology stop, not a conventional beach visit; its main draw is the fossil reef, quarry and shaded walking routes.
FAQ
What can you see at Windley Key Fossil Reef Geological State Park?
The park has fossilized coral exposed in old quarry walls, along with walking trails through a hardwood hammock, interpretive signs and educational exhibits.
How many trails are in the park?
There are five self-guided trails. A numbered guidebook from the ranger station explains stops along the routes.
What is the connection to Henry Flagler?
The quarry supplied stone used in building Flagler’s Overseas Railroad. It also produced decorative Keystone for construction in the Keys.
Where is Windley Key Fossil Reef Geological State Park?
It is at 84900 Overseas Highway in Islamorada, near mile marker 84.9.
