DENVER — Life on Earth got into the shell game more than 200 million years earlier than previously thought,
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.
Fossilized eukaryotes — complex life-forms that include animals and plants — discovered in Canada are decked out in armorlike layers of mineral plates,
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, paleobiologist Phoebe Cohen said September 27 at the Geological Society of America’s annual meeting. At about 809 million years old,
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, the find is the oldest evidence of organisms controlling the formation of minerals,
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, a process called biomineralization.
This new origin of biomineralization coincides with major changes that mark the end of a period known as the “boring billion” (SN: 11/14/15,
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, p. 1, said Stanford University paleontologist Erik Sperling,
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, who was not involved in the discovery. “There were big things going on with ocean chemistry,” he said. “It’s interesting to see the biological response.”
These ancient eukaryotes built their exoskeletons using a very different process from most modern shell-making microbes. That uniqueness offers insights into how the mineral-making ability first evolved,
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, said Cohen, who studies ancient ecosystems at Williams College in Williamstown,
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, Mass.
“We have been able to identify specific conditions that facilitated the evolution of the first eukaryote to biomineralize in Earth’s history,” she said. “It paints a beautiful picture of the ecology and evolution and environmental conditions that led to this dramatic

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