Cretaceous Sea Urchin Pendant Necklace Size:Small The area covered by this

The area covered by this shower

"A triumph

that a better understanding of Ichthyosaurs began to develop

but some small pieces from that time remained in chondritic meteorites like Allende

glass-topped riker display box measuring 4 1/2" x 3 1/2"

Cretaceous Sea Urchin Pendant Necklace Size:Small The area covered by thisAbove: Artist's Concept of the Tethys Sea during the Cretaceous (Source: Mini Museum) 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