10.1" Alethopteris Fern Plant Leaf Fossil Carboniferous Age Llewellyn FM ST Clair, PA Postosuchus trilobites thrived in Earth’s ancient
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10.1" Alethopteris Fern Plant Leaf Fossil Carboniferous Age Llewellyn FM ST Clair, PA Postosuchus trilobites thrived in Earth’s ancient trilobites thrived in Earth’s ancient oceans and became one of the most characteristic life forms of the Paleozoic Era The living creature occupied only the outermost body chamber Dimensions: 10 The fossilization process began with pyrite replacing the plant tissues