Sea Urchin lunarhighlands Walter Alvarez

Walter Alvarez

and also gives the glass its protective qualities

This specimen is a precision-cut segment of ladder rung from the Khumbu Glacier on Mount Everest

000 years ago) - "The Great Dying" is the largest extinction event in the history of the planet

the City of Masks

Sea Urchin lunarhighlands Walter AlvarezAbove: 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