Oolite is a type of limestone found in Southeastern Florida. This material is environmentally friendly and is available in a large variety of sizes. The size used for this walkway is 24″ Wide x 48″ Length X 4″ thick. The great thing about this material is that it is mined locally in the South Florida area thus keeping the costs down. Oolite can also be used as wall cladding and to build retaining walls.