Sea Urchin chemistry “Variability and Evolutionary Rate in

“Variability and Evolutionary Rate in the Oreodonts

Our target size is approximately 1x1 cm

Average weight is roughly 0

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

plesiosaurs

Sea Urchin chemistry “Variability and Evolutionary Rate inAbove: 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