Occurrence of a Ctenacanthoid Shark Spine from the Upper Devonian of North Central Iowa

Authors

Markes E. Johnson, University of ChicagoFollow

Document Type

Research

Keywords

Ichthyodorulite, Lime Creek Formation, Ctenacanthoid Shark Spine

Abstract

Although a diverse, invertebrate fauna is characteristic of the Upper Devonian, Lime Creek Formation, in north central Iowa, fossil fish remains are sparse. A detached and incomplete shark spine with ctenacanthoid features is reported and described. The specimen is the best example of the first occurrences of its kind from Devonian of Iowa. Despite some asymmetry in shape, the spine is interpreted as the cutwater of a dorsal fin. Overall length of the shark is estimated at l-l.5m.

Publication Date

June 1974

Journal Title

Proceedings of the Iowa Academy of Science

Volume

81

Issue

2

First Page

56

Last Page

60

Copyright

©1974 Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

Recommended Citation

Johnson, Markes E. (1974) "Occurrence of a Ctenacanthoid Shark Spine from the Upper Devonian of North Central Iowa," Proceedings of the Iowa Academy of Science, 81(2), 56-60.
Available at: https://scholarworks.uni.edu/pias/vol81/iss2/6