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This slab measures approximately 7.5 x 6 cm and features a three-dimensional crinoid calyx measuring approximately 4 x 3.5 cm. It is in perfect condition and has been cleaned using sandblasting.
This is a famous fossil site, renowned for the quality and variety of its fossils, including over 100 different species of crinoids.
Carboniferous, Edwardsville Formation
Montgomery County, Indiana, USA