Early Ordovician arthropod trace fossils in the Prague Basin (Czech Republic)

Arthropod trace fossils of the of the Ordovician age are reviewed by Mikulásˇ (1999); most reports came from the Cruziana Ichnofacies of the Sandbian to Katian age (Zahorˇany and Bohdalec formations). Unlike to SW Europe, where Cruziana trace fossils are quite common in the early middle Ordovician in Bohemia this ichnofossil has been unknown in sediments of Tremadocian to Dapingian age. Surprisingly, the probably trilobite trace fossils has newly been observed in the succession from which arthropod fossils are unknown. Arthropod trace fossils are associated with abundant resting ?cnidarian burrows and rare other ichnofossils.