Name: Cupulocrinus humilis (Cupulocinidae), Porocrinus sp. (Porocrinidae)
Geological Time: Middle Ordovician
Size: Cupulocrinus: 35 mm long , 25 mm across with 50 mm associated stem, 28 mm long, 20 mm across, 18 mm long, 18 mm across Porocrinus: 45 mm long by 13 mm across Matrix: 125 mm by 135 mm
Fossil Site: Bobcaygeon Formation, Trenton Group, Simcoe County, Ontario, Canada
 This
plate displays a fine grouping of Cladid crinoids found in the Middle
Ordovician Trenton Group deposits of Simcoe County, Ontario, Canada.
This one has three specimens of Cupulocrinus humilis in fine three
dimensional relief. The Cupulocrinidae are thought to be closely related
to the Flexibilia, but they themselves left no descendants. The example
at the far left is seen with a bryozoan, most likely a species of
Batostoma. The other uncommon crinoid is a Prorocrinus, seen in the
very center of the plaque. All fossil animals are the result of a
natural association. |
