Jimbacrinus and Neocamptocrinus Permian Crinoid Assemblage
Order Ampelocrinida, Family Calceolispongiidae
Order Monobathrida, Family Dichocrinidae
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
Cundlego Formation, Gascoyne Junction, Western Australia
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.
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.
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.
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
entirely of fossil crinoids.
fossil pictures to enlarge