Cryptoblastus

Cryptoblastus, collected from the Burlington Limestone, Iowa

Cryptoblastus, extinct genus of blastoids, a primitive group of echinoderms related to the modern sea lilies, found as fossils in Early Carboniferous marine rocks (the Early Carboniferous Period occurred from 360 to 320 million years ago).

Citation Information
Article Title: Cryptoblastus
Website Name: Encyclopaedia Britannica
Publisher: Encyclopaedia Britannica, Inc.
Date Published: 06 March 2016
Access Date: February 22, 2025