Keystone (limestone)

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Example of keystone at the Hurricane Monument.
Example of keystone at the Hurricane Monument.
Example of keystone at the Hurricane Monument.
Example of keystone at the Hurricane Monument.

Keystone refers to a type of limestone, or coral rag, quarried in the Florida Keys, in particular from Windley Key fossil quarry, which is now a State Park of Florida. The limestone is Pleistocene in age, and the rock primarily consists of scleractinian coral, such as Elkhorn coral and Brain coral.

The Hurricane Monument, commemorating victims of the Labor Day Hurricane of 1935, and located at mile marker 82 on US Route 1 near Islamorada, is constructed of keystone.

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