Crinoid Onychocrinus Ulrichi in its veinstone, USA (Indiana), Lower Carboniferous (325 million years old), on base, long. crinoid: 20 cm
Crinoid Onychocrinus Ulrichi in its veinstone, USA (Indiana), Lower Carboniferous (325 million years old), on base, long. crinoid: 20 cm