This is a sea lily, Macrocrinus, from Indiana, USA. From the Early Carboniferous (approx. 359 million - 330 million years ago).
Sea lilies from Indiana, USA, are famous, and high-quality fossils are found there.

Sea lily fossils are often found with the crown and stem separated, but this specimen was preserved with the long stem still connected to the crown. Although small, it is a rare specimen.