Abstract
AbstractA new ichnogenus and ichnospecies,Spirolites radwanskii, is a spiral boring recognized in large limestone clasts deposited in a Miocene cliff-foot ramp. It is characterized by a semi-circular or inverted Ω-shaped cross section, gradually increasing width, gradual entrenching in the rock from the narrower side, consistent coiling direction, steep margin from the wider side, two-order annuli, and occasional truncation of the narrower side by the wider part. It is interpreted as a boring of vermetid gastropods, similar to the recentDendropoma.Spirolitesco-occurs with the bivalve boringsGastrochaenolites, mostlyG.torpedo, sponge boringsEntobia, and the spionid polychaete boringCaulostrepsis, which are typical of theEntobiaichnofacies.Spiroliteswas produced in very shallow, clean and warm sea waters.
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