The Archiocidaris brownwoodensis sea urchins from the Brownwood Lake Spillway site were marine animals which died with their spines still attached. This is a rare occurrence. The mud, or current matrix, around these sea urchins was not disturbed after they died, leaving them nearly complete. Because of their nearly perfect condition it is assumed that their death was not caused by force, but from some type of cataclysmic event, possibly a rapid change in salinity of the water, a change in temperature, or a sudden silting of the area in which they lived.
Kingdom: Animalia, Phylum: Echinodermata, Class: Echinoidea, Subclass: Euechinoidea, Order: Cidaroidea, Family: Archaeocidaridae, Genus: Archaeocidaris, Species: brownwoodensis.
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