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Pentremites Blastoid echinoderm fossil a.jpg

Dpaul7

Pentremites Blastoid echinoderm fossil

 

Kentucky, USA
Early to Middle Carboniferous, from 360.7 to 314.6 years ago
Blastoids (class Blastoidea) are an extinct type of stemmed echinoderm. Often called sea buds, blastoid fossils look like small hickory nuts. They first appear, along with many other echinoderm classes, in the Ordovician period, and reached their greatest diversity in the Mississippian subperiod of the Carboniferous period. However, blastoids may have originated in the Cambrian. Blastoids persisted until their extinction at the end of Permian, about 250 million years ago. Although never as diverse as their contemporary relatives, the crinoids, blastoids are common fossils, especially in many Mississippian-age rocks.
Kingdom: Animalia
Phylum: Echinodermata
Class: Blastoidea
Order: Spiraculata
Family: Pentremitidae
Genus: Pentremites



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Photo Information for Pentremites Blastoid echinoderm fossil a.jpg

Taken with Canon Canon PowerShot SX120 IS

  • 6 mm
  • 1/50
  • f f/2.8
  • ISO 200
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