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Unknown Maquoketa Trilobite

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Found this while splitting some slabs I brought home from an outcrop of the Maquoketa Group (Upper Ordovician) in Illinois. Started a bit of prep work but figured I'd try to see what I'm dealing with before going any further. My completely uneducated guess would be a lichid pygidium or something of the sort?



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There are two commonly (actually no lichid is common to the Maquoketa) encountered lichid in the Maquoketa Formation: Amphilichas clermontensis and Amphilichas bicornis. The texture observed on your specimen would suggest A. bicornis rather than clermontensis but the texture appears subdued for bicornis. It may be another unknown. Continue the careful prep that you have started.



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