1. NUCULOIDEAN TRACE FOSSILS IN THE SHALLOW MARINE MIOCENE OF THE VALLÈS-PENEDÈS BASIN (NE IBERIAN PENINSULA) Jordi M. de Gibert - Rosa Domènech
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6. Ichnological record of bivalves ...AND MORE COMPLEX STRUCTURES bioturbation structures Lockeia Protovirgularia Lophoctenium Ekdale, A.A. & Bromley, R.G. 2001: A day and a night in the life of a cleft-foot clam: Protovirgularia–Lockeia–Lophoctenium. Lethaia , Vol. 34, pp. 119–124. Pennsylvanian, Arkansas