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The Geology of Indiana Limestone: How 340 Million Years Created a Building Stone

SD Stone Doc Technical insights on Indiana limestone Three hundred forty million years ago, Indiana was at the bottom of a shallow tropical sea. The water was warm and clear — similar to the modern Bahamas. Marine organisms thrived in these conditions: crinoids, brachiopods, bryozoans, corals. They lived, died, and accumulated on the sea floor.

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