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Super-Spiky Ancient Worm Makes Its Debut

nationalgeographic.com

From fantastical to frightening, the animals of the Cambrian Period—beginning about 540 million years ago—tantalize the imagination. And they just keep getting weirder.

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Snow highlights cross-bedding on the sides of buttes and mesas along the Clear Creek drainage on the east side of Zion National Park. Cross-beds in the nearly 2,000-foot-thick Jurassic-age Navajo Sandstone formed in ancient sand dunes and reflect changing wind directions as the sand was being deposited. Zion National Park, Kane County, Utah Photographer: Adam Hiscock; © 2015Utah Friend of Paleontology (UFOP) has a new website
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Snow highlights cross-bedding on the sides of buttes and mesas along the Clear Creek drainage on the east side of Zion National Park. Cross-beds in the nearly 2,000-foot-thick Jurassic-age Navajo Sandstone formed in ancient sand dunes and reflect changing wind directions as the sand was being deposited. Zion National Park, Kane County, Utah Photographer: Adam Hiscock; © 2015REBATES AVAILABLE FOR ENERGY-EFFICIENT UPGRADES