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Earliest Evidence for Animal Life

Staff writer |
Discovered fossil animal steroids date back to more than 635 million years ago, says UC Riverside’s Gordon Love.

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An international team of scientists from UC Riverside, the Massachusetts Institute of Technology and other institutions has found the oldest evidence for animals in the fossil record. The researchers examined sedimentary rocks in south Oman, and found an anomalously high amount of distinctive steroids that date back to 635 million years ago, to around the end of the last immense ice age. The steroids are produced by sponges – one of the simplest forms of multicellular animals.

The researchers argue that the discovery of the sponges is evidence for multicellular animal life beginning 100 million years before the Cambrian explosion, a well-studied and unique episode in Earth history that began about 530 million years ago when, as indicated by the fossil record, animal life diversified rapidly. The discovery can help scientists reconstruct Earth’s early ecosystems and explain how animal life may have first evolved on the planet.

“Our findings suggest that the evolution of multicellular animals began earlier than has been thought,” said Gordon Love, an assistant professor of Earth sciences, who led the research group. Love began working on the project while he was a postdoctoral researcher at MIT. “Moreover, sponges live on the seafloor, growing initially in shallow waters and spreading, over time, into deeper waters, implying the existence of oceanic environments which contained dissolved oxygen near the shallow seafloor around 635 million years ago.”

The sponge findings emerged from a project Love was working on at MIT (with Roger Summons, a professor of geobiology) in collaboration with Petroleum Development Oman. Using state-of–the-art techniques, he and his colleagues analyzed 64 Neoproterozoic-Cambrian sedimentary rock samples from the South Oman Salt Basin (SOSB), a region known for some of the best preserved rocks in the world. The researchers also established a robust stratigraphic and temporal framework for the SOSB rocks as part of their analysis.

Next, Love and his colleagues plan to screen other Neoproterozoic sedimentary rocks for animal steroids just before and through the Sturtian and Marinoan glaciations, the greatest ice ages known to have occurred on Earth during 850 to 635 million years ago. “We aim to investigate the environmental context by which multicellular animal life became viable and flourished,” he said.

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