Daily Archives: January 16, 2011

Wooster’s Fossil of the Week: A cystoid (Middle Ordovician of northeastern Estonia)

Fossils don’t get much more spherical than Echinosphaerites aurantium, an extinct creature common in the Early and Middle Ordovician of North America and Europe. These are cystoids, a somewhat informal category of filter-feeding, stalked echinoderms that are relatives of the … Continue reading

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