Science & Tech · Science & Environment · 6 hrs ago
Review links Earth's ancient geology to the Cambrian explosion
About half a billion years ago, many major animal groups first appeared in the fossil record during a burst called the Cambrian explosion.
A team led by geologist Jinlong Yao proposes that several changes in Earth's solid surface helped set it off.
The review traces one possible chain from the breakup of the supercontinent Rodinia to volcanic eruptions, global cooling and a period when ice spread widely.
Later, mountain building as Gondwana formed may have sent nutrients into the oceans, helping algae and bacteria produce oxygen.
The team also points to a magnetic field that may have weakened to about one-tenth of its current strength, but says no single change explains the diversification.
The review draws on earlier research rather than new measurements, and most proposed links remain untested ideas.
A new review links ancient geological changes to the Cambrian explosion, when many major animal groups first appeared in the fossil record about half a billion years ago.
The team argues that several processes acted together, including the breakup of a supercontinent, mountain building and changes in Earth’s magnetic field.
The review draws on decades of published research rather than new measurements.
Its authors say most proposed links between the deep Earth and early life remain untested.
- Who
- Geologist Jinlong Yao of Northwest University in Xi’an, China, led the review with six colleagues, including Guochun Zhao of the University of Hong Kong.
- What
- The review proposes that ancient geological processes helped trigger the Cambrian explosion.
- When
- The Cambrian explosion occurred about half a billion years ago. Rodinia began breaking apart roughly 850 million years ago.
- Where
- The review discusses global geological processes, including mountain building and changes in the oceans.
- Why
- The authors argue that several geological processes acted together, but say the proposed links remain largely untested.
This story does not have two clearly opposing sides.
The supercontinent Rodinia began pulling apart.
Continental collisions raised mountain belts as Gondwana came together.
Many major animal groups first appeared in the fossil record during the Cambrian explosion.
- Review lead
- Jinlong Yao, Northwest University in Xi’an, China
- Review team
- Yao and six colleagues
- Rodinia breakup
- Roughly 850 million years ago
- Ancient mountain belt
- About 5,600 miles (9,000 kilometers) long
- Cambrian explosion
- About half a billion years ago