Detailed information for reference 33904Hantzschel, W. (1962) Trace fossils and Problematica. In: Moore, R.C. (ed.) Treatise on Invertebrate Paleontology, Part W, Miscellanea, Conodonts, Conoidal Shells of Uncertain Affinities, Worms, Trace Fossils and Problematica. Geological Society of America and University of Kansas Press, New York. , figs. 110-149.
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