connorp Posted May 27, 2020 Share Posted May 27, 2020 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? Link to comment Share on other sites More sharing options...
Roadcut1 Posted June 2, 2020 Share Posted June 2, 2020 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. al 1 Link to comment Share on other sites More sharing options...
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