250 - 490 million y/o #Crinoid fossil found by the Missouri River a few years back

#shorts
#fossils
#Crinoids comprise a highly varied group of echinoderm invertebrate animals that have inhabited the shallow to abyssal marine environment from the beginning of the Ordovician Period of geologic time (490 million years ago) to present day. Crinoids have a plant-like appearance and are often called “Sea Lilies” because of that resemblance; however, they are not plants. Crinoids have a five-point radial symmetry and are related to other echinoderms, such as the starfish, sea urchin and sand dollar. They are considered to possess the most complex anatomy of all marine invertebrates and like their starfish cousins, crinoids have been studied extensively because they can regenerate tissue, organs and even limbs. 

Crinoids thrived during the Paleozoic Era (490 through 250 million years ago) and reached their apex during the Mississippian Period (360 through 320 million years ago). For millions of years, crinoids covered the ocean floor. Thousands of species of crinoids evolved and became extinct through geologic time. They, along with 96% of all marine life on the planet, perished during the mass extinction event called “The Great Dying,” which occurred at the end of the Permian Period, roughly 251 million years ago. 

https://dnr.mo.gov/document-search/crinoid-missouris-official-state-fossil-pub0660/pub0660

Видео 250 - 490 million y/o #Crinoid fossil found by the Missouri River a few years back канала LJ Short