Sea Urchin chemistry The final impact emitted a

The final impact emitted a booming explosion that was heard and felt for nearly 200 miles

is estimated to have had an area of half a mile

Average weight is roughly 0

Our target size is approximately 1x1 cm

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

Sea Urchin chemistry The final impact emitted aAbove: 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