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Psammechinus carolinensis
Images: 
By sixgill pete
Taxonomy
"Cheerios"
Kingdom: Animalia
Phylum: Echinodermata
Class: Echinoidea
Order: Echinoida
Family: Echinoidae
Genus: Psammechinus
Species: Psammechinus carolinensis
Author Citation Kier, 1997
Geological Time Scale
Eon: Phanerozoic
Era: Cenozoic
Period: Neogene
Sub Period: None
Epoch: Oligocene
International Age: Rupelian
Stratigraphy
River Bend Formation
Provenance
Collector: Don Rideout
Date Collected: 11/09/2014
Acquired by: Field Collection
Dimensions
Thickness: 2.9 mm
Diameter: 6.1 mm
Location
Martin Marietta Quarry
Jones County
North Carolina
United States
Comments
These little echinoids, referred to locally sometimes as "cheerios" because they average about the same size as one. They are a relatively common find in the basal sands of the early Oligocene River Bend Formation, often in association with Rebecapecten trentensis. This specimen is one of my smaller ones; 6.1 mm in diameter and is cleaner than most. Many of these have a calcite coating with black and white sand granules on them. In the last photo; the group shot, it is the one on the upper left. The smallest in the case.
Reference:
Kier, P.M. (1997) Smithsonian Contributions To Paleobiology : Number 83, Oligocene Echinoids of North Carolina. Pgs. 5-6, plate 3 figs. 1-4 and plate 4 figs. 1-5
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