A slab of rock that carries the fossilized imprints of jellyfish, found at a quarry in Wisconsin, is seen at the Caltech campus in Pasadena, Calif., Thursday, Jan. 24, 2002. More than a half-billion ... more 
A slab of rock that carries the fossilized imprints of jellyfish, found at a quarry in Wisconsin, is seen at the Caltech campus in Pasadena, Calif., Thursday, Jan. 24, 2002. More than a half-billion years after they washed ashore in numbers that would alarm beachgoers even today, a trove of fossilized jellyfish, each frozen instone where it died, has been found in a Wisconsin rock quarry. (AP Photo/Reed Saxon) less 
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Associated Press | Photo By Reed Saxon
Tue, Jan 28, 2014 6:03 PM EST