For a land with a dearth of natural rock outcrops, the Netherlands abounds with urban ‘exposures’ of fossiliferous rocks such as building stones, street furniture and street art. In the Rapenburg in Leiden, sections through distinctive shells in Mississippian (Lower Carboniferous) limestones are identified as rostroconch molluscs (Order Conocardioidea). The generic identification is tentative, but the specimens may belong to the genus Filicardia Rogalla and Amler, perhaps the common Filicardia inflata (M’Coy). The only other mollusc taxon that has been identified from these rocks is the gastropod Straparollus? sp.
KeywordsMollusca Conocardioidea Mississippian Filicardia Building stones Urban geology
We acknowledge the support of Naturalis Biodiversity Center, Leiden, for facilitating this research project, and the enthusiasm of the many student groups from the University of Leiden that we have conducted down the Rapenburg in fair weather and foul. Special thanks to Ms. Karen Robinson for thrusting the print into S. K. D.’s hands which led to the solution of this investigation; the relevant part is reproduced as Fig. 2 herein. Special thanks to our reviewers for their pertinent comments, Professor Franz T. Fürsich (Friedrich-Alexander Universität, Erlangen), and particularly, Dr. Michael R. W. Amler (Universität zu Köln and Phillips-Universität Marburg).
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