Did tidal zone trilobites lead the way onto land?

With their Cambrian-defining ubiquity, 270-million-year longevity and impressive diversity, trilobites often rank as people’s favorite sort of fossil. Now a set of 500-million-year-old trace fossils found in Tennessee is potentially expanding the trilobites’ territory from the deep ocean all the way inland to the resource-rich Cambrian tidal flats. But whether the tracks mean that trilobites were part of an ecological bridge that helped animals transition from the sea onto land to colonize the empty continents is up for debate.

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Mary Caperton Morton

Mary Caperton Morton

Morton (https://theblondecoyote.com/) is a freelance science and travel writer based in Big Sky, Mont., and an EARTH roving correspondent.  

Sunday, June 22, 2014 - 06:00