It is commonly understood that the dinosaurs disappeared with a bang - wiped out by a great meteorite impact on the Earth 66 million years ago.

But their origins have been less understood. In a new study, scientists from MUSE - Museum of Science, Trento, Italy, Universities of Ferrara and Padova, Italy and the University of Bristol show that the key expansion of dinosaurs was also triggered by a crisis - a mass extinction that happened 232 million years ago.

In the new paper, published in Nature Communications, evidence is provided to match the two events - the mass extinction, called the Carnian Pluvial Episode, and the initial diversification of dinosaurs.

Dinosaurs had originated much earlier, at the beginning of the Triassic Period, some 245 million years ago, but they remained very rare until the shock events in the Carnian 13 million years later.

The new study shows just when dinosaurs took over by using detailed evidence from rock sequences in the Dolomites, in north Italy - here the dinosaurs are detected from their footprints.

First there were no dinosaur tracks, and then there were many. This marks the moment of their explosion, and the rock successions in the Dolomites are well dated. Comparison with rock successions in Argentina and Brazil, here the first extensive skeletons of dinosaurs occur, show the explosion happened at the same time there as well.

Lead author Dr Massimo Bernardi, Curator at MUSE and Research associate at Bristol's School of Earth Sciences, said: "We were excited to see that the footprints and skeletons told the same story. We had been studying the footprints in the Dolomites for some time, and it's amazing how clear cut the change from 'no dinosaurs' to 'all dinosaurs' was."

The point of explosion of dinosaurs matches the end of the Carnian Pluvial Episode, a time when climates shuttled from dry to humid and back to dry again.

It was long suspected that this event had caused upheavals among life on land and in the sea, but the details were not clear. Then, in 2015, dating of rock sections and measurement of oxygen and carbon values showed just what had happened.

There were massive eruptions in western Canada, represented today by the great Wrangellia basalts - these drove bursts of global warming, acid rain, and killing on land and in the oceans.

Co-author Piero Gianolla, from the University of Ferrara, added: "We had detected evidence for the climate change in the Dolomites. There were four pulses of warming and climate perturbation, all within a million years or so. This must have led to repeated extinctions."

Professor Mike Benton, also a co-author, from the University of Bristol, said: "The discovery of the existence of a link between the first diversification of dinosaurs and a global mass extinction is important.

"The extinction didn't just clear the way for the age of the dinosaurs, but also for the origins of many modern groups, including lizards, crocodiles, turtles, and mammals - key land animals today."

Research Report: 'Dinosaur diversification linked with the Carnian Pluvial Episode' by M. Bernardi, P. Gianolla, F. Petti, P. Mietto and M. Benton in Nature Communications - DOI: 10.1038/s41467-018-03996-1

Related Links
University of Bristol
Explore The Early Earth at TerraDaily.com

Tweet

Thanks for being here; We need your help. The Space Media Network continues to grow but revenues have never been harder to maintain. With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords. Our news coverage takes time and effort to publish 365 days a year. If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.
SpaceMediaNetwork Contributor $5 Billed Once credit card or paypal		SpaceMediaNetwork Monthly Supporter $5 Billed Monthly paypal only

Marine fish won an evolutionary lottery 66 million years ago
Los Angeles CA (SPX) Apr 19, 2018
Why do our oceans contain such a staggering diversity of fish of so many different sizes, shapes and colors? A UCLA-led team of biologists reports that the answer dates back 66 million years, when a six-mile-wide asteroid crashed to Earth, wiping out the dinosaurs and approximately 75 percent of the world's animal and plant species. Slightly more than half of today's fish are "marine fish," meaning they live in oceans. And most marine fish, including tuna, halibut, grouper, sea horses and mahi-mah ... read more