Mississipian, 350-310 million BC, crinoid from Warsaw formation, Adams Co.,
Illinois, USA, abrotocrinus coreyi, 12x6mm head on matrix, $10.00 sold
 

Mississippian (Osagean), 280-250 million BC, crinoid from Montgomery Co,
Indiana, Edwardsville formation, camerate crinoid, macrocrinus mundulus,
13x8mm head is nice, trace of stalk peeking out from under, on 35x27mm
matrix block, $25.00 sold
 

Mississippian (Osagean), 280-250 million BC, crinoid from Montgomery Co,
Indiana, Edwardsville formation, inadunate crinoid, undetermined species,
15x8mm head, 15mm curved stalk on 39x25mm matrix slab, $32.00 sold