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New genus of Late Cambrian gastropod

  • Gerald O. Gunderson (a1)
Extract

Gastropods are rare fossils in the Cambrian of Wisconsin. They are usually small and flattened. During the summer of 1978, while collecting trilobites along the western side of the state, I discovered a new gastropod in the Crepicephalus zone (as defined by Twenhofel, Raasch, and Thwaites, 1935; Nelson, 1951). It is a three-dimensional fossil represented by external mold and steinkern. This was the only gastropod uncovered during the splitting of over 200 kilograms of sandstone, which also yielded hundreds of trilobite cranidia and pygidia.

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References
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Knight, J. B. 1941. Paleozoic gastropod genotypes. Geological Society of America, Special Paper 32, 510 p.
Knight, J. B., Batten, R. L., and Yochelson, E. L. 1960. Descriptions of Paleozoic gastropods, p. 180. In Moore, R. C. (ed.), Treatise on Invertebrate Paleontology, Vol. I, Mollusca 1. Geological Society of America and University of Kansas Press, Lawrence.
M'Coy, F. 1851. On some new Silurian Mollusca. Annals and Magazine of Natural History, 2nd Series, 7:4563.
Nelson, C. A. 1951. Cambrian Trilobites from the St. Croix Valley. Journal of Paleontology, 25:565784.
Thiele, J. 1925. Mollusca–Weichtiere, p. 1596. In Kukenthal, W. (ed.), Handbuch der Zoologie. Funfter Band, Erste Halfte, Erste Lieferung, Berlin and Leipzig.
Twenhofel, W. H., Raasch, G. O., and Thwaites, F. T. 1935. Cambrian strata of Wisconsin. Geological Society of America, Bulletin 46, 1,695 p.
Ulrich, E. O., and Scofield, W. H. 1897. The Lower Silurian Gastropoda of Minnesota. Minnesota Geological Survey, Final Report 3, P 2:8131081.
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Journal of Paleontology
  • ISSN: 0022-3360
  • EISSN: 1937-2337
  • URL: /core/journals/journal-of-paleontology
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