About Windley Key Fossil Reef Geological State Park
Windley Key Fossil Reef Geological State Park is a Florida State Park located at mile marker 85.5 on US 1 near Islamorada. It was a former quarry used by Henry Flagler in the early 1900s to help his building of the Overseas Railroad. Following the railroad's completion, it was a source of decorative stone pieces called Keystone. Now on display are exposed sections of fossilized coral and some of the original quarry machinery. The Hurricane Monument at Mile Marker 82 in Islamorada is constructed of Keystone from the quarry. The Florida Geological Survey named it a State Geological Site in 1998.
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