Actinocerid nautiloids from the Lhasai Formation in the Xainza region are studied systematically for the first time. The nautiloids are identified as Middle Ordovician in age based on stratigraphic ...
Eight species of nautiloid cephalopods assignable to the families Ascoceratidae, Lituitidae, and Apsidoceratidae are reported from the Upper Ordovician (Harjuan) Boda Limestone, which occurs in the ...
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