Great Lakes Rocks & Minerals | I soaked my chain coral in muriatic acid for about 24 hours | Facebook
Identifying Fossils on the Great Lakes Shores – Beachcombing Magazine
Louisville Fossils and Beyond: Chain Coral
My fossil (and agate) finds from a Lake Michigan beach. I recognize the honeycomb, horn, and chain corals. Trying to figure out what the agatized creature is (left side 2nd down). :