This is from the Wabaunsee Group (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Virgilian])
Includes: Wood Siding FM, Root Shale, Stotler Limestone (base ST), Pillsbury Shale, Zeandale Limestone (base Z), Willard Shale, Emporia Limestone (base E), Auburn Shale, Bern Limestone (base BR), Scranton Shale, Howard Limestone (base H), and Severy Shale.
Found these unknown objects attached to the interior of a myalina clam shell. This is a marine environment but I'm not sure which layer of the Wabaunsee Group this is from. I've never seen this before so would appreciate any help with ID.
I'd be happy to furnish more photos of layer and fossil.
Thanks