Sea Urchin chemistry 85" fossil plant that was

85" fossil plant that was recovered from Mazon Creek in Illinois

plesiosaurs

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“Variability and Evolutionary Rate in the Oreodonts

A small information card is also included

Sea Urchin chemistry 85" fossil plant that wasAbove: Front of the Specimen Card Ancient sea urchins, small and spiny creatures, have existed for millennia. These echinoids first appeared in oceans 450 million years ago, where they fed on algae and sponges. Their flexible spines purpose was two fold: to protect against predators and allow for the slow crawl towards the urchins next meal. Buried for millions of years, their fossils appear in many places where those oceans once were and have