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Unusual Devonian Cystoid from Iowa
CYSTOIDS
Stock Number XICY16

Name:   Strobilocystites calvini
Age:  Devonian
Formation:  Cedar Valley
Location:  Linn County, Iowa
Size:  Cystoid is 0.9 inches across
This specimen is not for sale
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This is a rare cystoid. This specimen is Strobilocystites calvini from the Devonian of Iowa. This is one of the youngest cystoids known to exist. These primitive echinoderms are usually found in Ordovician and Silurian rocks - very few are found in Devonian age layers - and none are found in younger sediments. This specimen is very 3-dimensional and exhibits fine detail. The plate structure is very good. Most of the plates are beautifully displayed and the ambulacra are visible. The white cystoid contrasts well with the yellowish-gray matrix that is loaded with other fossils. This is a fine example of this unusual echinoderm.