Ancient crab brain preserved in a different way


The brain of a horseshoe crab that lived about 310 million years ago was preserved due to siderite, an iron carbonate mineral, which formed rapidly and preserved its soft tissues, according to findings reported in Geology. Typically, soft tissues are lost because of their quick decay, but researchers were able to learn more about the creature's central nervous system due to the preservation of the horseshoe crab specimen found at the Mazon Creek site in Illinois.

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