Researchers report that crystallization by particle attachment (CPA) from amorphous calcium carbonate (ACC), a skeletal formation mechanism common to diverse animal taxa, is associated with a granular structure detectable via scanning electron microscopy, and that this structure is present in some of the oldest known fossils of calcium carbonate skeletons--500 million years or older--suggesting that CPA from ACC has been used to form skeletons throughout animal history.
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Article #19-02273: "Biomineralization by particle attachment in early animals," by Pupa U. P. A. Gilbert et al.
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Proceedings of the National Academy of Sciences