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Hi, need help with this Id, Sugar run formation, IL. Any help appreciated. Measures about 2cm either direction. 

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Definitely lichid with these spectacular tubercles and obvious lobes. I'll tag @piranha for a closer diagnosis. What a phenomenal piece! So fully inflated, too. :wub:

  • I found this Informative 3

...How to Philosophize with a Hammer

 

 

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Your answer may be bere:

Classification and Phylogeny of the Trilobite Order Lichida
Author(s): A. T. Thomas and D. J. Holloway
Source: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences, Vol. 321, No. 1205 (Aug. 26, 1988), pp. 179-262

 

I can probably send you this.

  • I found this Informative 5

...How to Philosophize with a Hammer

 

 

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Trochurus welleri is the described species at Sugar Run.

Attached for comparison: Trochurus depauperatus (figs. 110, 116, 117) from the St. Clair Limestone of Arkansas.  Congrats! happy0144.gif

 

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Thomas, A.T., Holloway, D.J. 1988
Classification and Phylogeny of the Trilobite Order Lichida.
Philosophical Transactions of the Royal Society of London, Series B 321:179-262  PDF LINK

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image.png.a84de26dad44fb03836a743755df237c.png

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