ANU-led study solves mystery of how first animals appeared on Earth

ANU-led study solves mystery of how first animals appeared on Earth


Thursday, August 17, 2017 — Research led by The Australian National University (ANU) has solved the mystery of how the first animals appeared on Earth, a pivotal moment for the planet without which humans would not exist.

Lead researcher Associate Professor Jochen Brocks said the team found the answer in ancient sedimentary rocks from central Australia.

“We crushed these rocks to powder and extracted molecules of ancient organisms from them,” said Dr Brocks from the ANU Research School of Earth Sciences.

“These molecules tell us that it really became interesting 650 million years ago. It was a revolution of ecosystems, it was the rise of algae.”  

Dr Brocks said the rise of algae triggered one of the most profound ecological revolutions in Earth’s history, without which humans and other animals would not exist.

“Before all of this happened, there was a dramatic event 50 million years earlier called Snowball Earth,” he said.

“The Earth was frozen over for 50 million years. Huge glaciers ground entire mountain ranges to powder that released nutrients, and when the snow melted during an extreme global heating event rivers washed torrents of nutrients into the ocean.”

Dr Brocks said the extremely high levels of nutrients in the ocean, and cooling of global temperatures to more hospitable levels, created the perfect conditions for the rapid spread of algae. It was the transition from oceans being dominated by bacteria to a world inhabited by more complex life, he said.

“These large and nutritious organisms at the base of the food web provided the burst of energy required for the evolution of complex ecosystems, where increasingly large and complex animals, including humans, could thrive on Earth,” Dr Brocks said.

Co-lead researcher Dr Amber Jarrett discovered ancient sedimentary rocks from central Australia that related directly to the period just after the melting of Snowball Earth.

“In these rocks we discovered striking signals of molecular fossils,” said Dr Jarrett, an ANU Research School of Earth Sciences PhD graduate.

“We immediately knew that we had made a ground-breaking discovery that snowball Earth was directly involved in the evolution of large and complex life.”

The research is published in Nature, and the findings will be presented at the Goldschmidt Conference in Paris, France, this week.

Photographs, graphics including an animation, a video interview with the researchers and a copy of the research paper (not for quoting) can be downloaded from <>. Please credit the photographs, animation, graphical frames and video to ANU*.

Watch the video on the ANU YouTube channel: (unlisted and unsearchable until the embargo lifts).

All material is under strict embargo until 3am Thursday 17 August 2017 (AEST).

*ANU acknowledges the work of Rose Draper from the Australian Academy of Science in the production of the animation and graphical frames.


Associate Professor Jochen Brocks
ANU Research School of Earth Sciences
T: +61 2 6125 7946
M: +61 432 470 006
Skype: jbrocks

Dr Brocks will be in France from Sunday 13 August until Saturday 19 August 2017. Best to contact him by email or WhatsApp in the first instance. He will be presenting the findings of the research at the Goldschmidt Conference, which is organised by European Association of Geochemistry and the Geochemical Society.

Dr Amber Jarrett
ANU Research School of Earth Sciences PhD graduate
M: +61 424 886 662

Dr Jarrett is in Brisbane, Australia, where she will be sampling ancient sedimentary rocks from a drill core facility until Thursday 17 August 2017.



Will Wright
ANU media team
T: +61 2 6125 7979
M: +61 478 337 740

ANU-led study solves mystery of how first animals appeared on Earth