Gogia
spiralis
Phylum
Echinodermata, Subphylum Blastozoa, Class Eocrinoidea (also called
Dawn Crinoid, or Eocrinoid)
Bolaspidella
housensis
Trilobita
Order Ptychopariida, Family Menomoniidae
Geological
Time: Middle Cambrian
Size: Matrix
65mm for perspective, Bolaspidella 9 mm, brachiopods 2 mm
Fossil
Site: Wheeler Shale, Millard County, Utah
Gogia is Cambrian cystoid that is among the earliest and most primitive
groups of echinoderms. For this reason they are sometimes called
a "dawn crinoids". They had a vase-shaped body (calyx),
covered by plates that were symmetrical and have a bifurcated brachiole,
a slender arm-like structure for food-gathering that closely resembled
those in cystoids.
This
association plate contains three complete dawn crinoids, in addition
to a Bolaspidella housensis trilobite and a few tiny brachiopods,
three distinct marine creatures coming out of the Cambrian explosion.
Also
see: Utah Cambrian Explosion
Fossils
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