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Keywords from Image Description:
Thallograptus. en Thallograptus sphaericola attached to the cystoid Echinosphaerites aurantium Ordovician of Estonia Own Wilson Photograph taken by Mark Wilson Department of Geology The College of Wooster wooster edu html Thallograptus Thallograptus fossils Echinosphaerites Cystoidea fossils Ordovician fossils from Estonia