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Separtian are formed from smaller sea life that were eliminated during the Cretaceous period. These carcasses sank to the bottom of the ocean bed and started decomposing. Over the eons, they formed into nodules or mud balls. Minerals such as calcite and aragonite filled the cracks in a concretion. When the ocean receded, the nodules dried out and began to shrink and crack into its distinct pattern you see today. This particular specimen is approximately 160 million years old!
Cold Hard Facts: