Jimbacrinus and Neocamptocrinus Permian Crinoid Assemblage

Jimbacrinus bostocki

Class Crinoidea, Order Ampelocrinida, Family Calceolispongiidae


Class Crinoidea, Order Monobathrida, Family Dichocrinidae

Geologic Time: Permian

Size: The Jimbacrinus is 3 3/8” in length. The large crinoid would be 3 ½” if outstretched. A secondary calyx is ½” on the reverse side. The plate is a 4 ½” x 3” x 1 ¾ piece of flat lying matrix

Fossil Site: Cundlego Formation, Gascoyne Junction, Western Australia

Code: PFO461

Price: $825.00

Description: This magnificent lifelike display piece is fully 3D. The specimen is nicely positioned on the red ocher colored plate. It was skillfully prepared to show exquisite detail of the crinoid crowns and stalks. The crinoid is fully complete, displaying the full crown with its gracefully folded arms. A rare large Neocamptocrinus is located on the center front side of the piece.

Jimbacrinus bostocki have become increasingly difficult to obtain in the last few years. I was able to acquire two at the 2014 Tucson Mineral and Fossil Show.

Jimbacrinus had five arms that were lined with fine tentacle-like structures called pinnules. Like all crinoids, it used these unfurled arms to feed on small animals and particles in the water. Fossils of Jimbacrinus show that they were abundant seafloor animals in what is now Western Australia during the Permian. They grew to approximately nine inches in length.

The crinoids have a long history. They were the first echinoderms to appear in the fossil record, and have retained their early structure throughout their long history. Crinoids were extremely common in the Palaeozoic, and some rocks from the Carboniferous consist almost entirely of fossil crinoids.

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