Scientists have discovered a new mass extinction of organisms that occurred 30 million years ago. This “reset button” is caused by the Earth’s cooling, the change of geological periods called eosin and oligosine. 63% animal loss From Europe, Asia and Africa.
“This is a real reset buttonSaid Dorian de Vries, a leading writer at the University of Salford in the UK.
The discovery, which compiles decades of work and reports on this undocumented catastrophe, was published this week in the journal Communications Biology.
in it Conversion from eosin to oligosine Nearly two-thirds of known species are endangered in Africa and the Iberian Peninsula, said one of the signatories to the research from Duke University in the United States.
They have disappeared, occurring about 30 million years ago, which occurred after the Earth’s climate cooled during the change of geological periods.
That time is denoted by a Severe Climate change, But what is happening in the present is the reverse. The terrain cooled, glaciers expanded, sea levels dropped, forests began to turn into grasslands, and carbon dioxide was low.
Although it is known that it has affected mammal species in Europe and Asia, until now it was believed that Africa could have escaped unscathed because its more temperate climate would have been a barrier against that cooling, but it was not.
This conclusion was reached by a team of researchers (from the UK, USA and Egypt) Study of a set Fossils Located in the fossil primate section of the Duke Lemour Center. This collection is the work of the late Elvin Simons de Duke, who spent decades searching for fossils in the Egyptian deserts.
Experts examined the fossils of five groups of mammals: one of the extinct carnivores called hyenodontes; Two from rodents, including squirrels and hedgehogs; The other two are animals, stressors (lemurs and loris), and humans (monkeys and monkeys).
By collecting data on the fossils, the team was able to Create evolutionary trees For these groups, identifying when new offspring branch out and marking the first and last known time of each species.
Evidence is in molar teeth
The evidence lies in the molar teeth of those animals, Can tell a lot about what a mammal eats and its environment.
Rodents and animals that reappeared a few million years later had different teeth. They were new species, eating different things and had different habitats.
“We see the loss of dental diversity, followed by a recovery period with new dental patterns and new adaptations.” Dijo de Dorian de Vries.
Rapid climate change is not the only challenge faced by some of those types of mammals. East Africa was also affected by a series of major geological events.
During this period volcanic eruptions occurred, covering vast areas with molten rocks, splitting the Arabian Peninsula from East Africa and opening up the Red Sea and the Gulf of Aden.
DW / mf / ds
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