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Llandoverian thelodont scales from the Burnt Bluff group of Wisconsin and Michigan

Published online by Cambridge University Press:  14 July 2015

Susan Turner ,
Jeffrey J. Kuglitsch  and
David L. Clark
Susan Turner
Affiliation:
1Queensland Museum, P.O. Box 3300, S. Brisbane, Queensland 4101, Australia
Jeffrey J. Kuglitsch
Affiliation:
2Department of Geology and Geophysics, University of Wisconsin, Madison 53706
David L. Clark
Affiliation:
2Department of Geology and Geophysics, University of Wisconsin, Madison 53706
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Abstract

Phosphatic microfossils including copious microvertebrates and conodont elements indicative of the upper Icriodella discreta–Icriodella deflecta Zone (Aeronian) are found in a single bed of the Hendricks Formation, Burnt Bluff Group, Sturgeon Bay, Wisconsin. Scales of thelodonts, including Loganellia sp. cf. Loganellia siberica Karajute-Talimaa, 1978, and rare Valyalepis crista Turner (in Turner and Nowlan, 1995) predominate among the microvertebrate remains. Most scales are referred to Zuegelepis potanus Turner new genus and species. Associated with the thelodont scales are rare phosphatic fragments of questionable dermal “bone” and scales, possibly of heterostracan origin. Thelodont scales are also found in the Hendricks Formation at Fayette State Park, Michigan and in the subsurface Byron Formation (Burnt Bluff Group) in Schoolcraft County, Michigan.

Type
Research Article
Information
Journal of Paleontology , Volume 73 , Issue 4 , July 1999 , pp. 667 - 676
Copyright
Copyright © The Paleontological Society 

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