Hypelocrinus sp.
Small square 'tablet' of grey siltstone. On the upper surface is a 3D crinoid calyx with several branching arms. Very unusual in that the actual calyx is very small and the individual columns making up the arms are very elongated.
Carboniferous, Mississippian, Keokuk Limestone.
Crawfordsville, Montgomery County, Indiana, U.S.A.
Crinoid : 1.4cm. long.
