This is a 4.2" wide fossil plate containing one crinoid (Rhodocrinites sp.) and one echinoid/sea urchin (Archaeocidaris aliquantula). It was collected from the Gilmore City Formation in Gilmore City, Iowa. Both are preserved 3D and have been prepared with air abrasives. This is a natural association and the specimens are not composites.
Comes with an acrylic display stand.
Crinoids, sometimes commonly referred to as sea lilies, are animals, not plants. They are echinoderms related to starfish, sea urchins, and brittle stars. Many crinoid traits are like other members of their phylum; such traits include tube feet, radial symmetry, a water vascular system, and appendages in multiples of five (pentameral). They first appeared in the Ordovician (488 million years ago) and some species are still alive today.