Saturday , December 5 2020

Evolution: South Africa's homework is a record-breaking weather friend

A new research from the team of international scientists led by Cape Town University isotope geochemist. Robyn Pickering is the first person to provide a timetable for fossils from caves in Humanity's Cradle. It also sheds light on the climate of our first ancestors in the region.

Published online in the journal Nature The study on November 21, 2018 corrected the assumptions that the fossil-rich caves of the region would never be associated with each other. In fact, the research suggests fossils dating from Cradle caves to only six specific time periods.

Eki Unlike the previous history studies, which focused on a cave, and even just one room of the cave, we provide a model for eight caves that explains the age of all fossils in the region and the ages directly,, says Dr Robyn Pickering.

"Now we can link the findings together from different caves and create a better picture of evolutionary history in South Africa."

The Cradle of Humanity is a World Heritage Site of complex fossil-bearing caves. It is the world's richest early host and is home to about 40% of all known human ancestor fossils, including the famous Australopithecus africanus skull, and Mrs. Ples.

On the basis of the uranium-lead, the researchers examined 28 streams of fossil-rich deposits in eight caves along the Cradle. The results showed that the fossils in these caves were six narrow time windows, 3.2 to 1.3 million years ago.

”Stones are key, Pick says Pickering. Iz We know that they can only develop in rainy precipitation outside the caves, when more rain falls outside the cave, we set the time of the rivers by filling in the time of the rains.

This means that the early universes living in the Cradle have undergone major changes in the local climates, and that they live at least six times a year, at least 3 to 1 million years, without wetting. However, only curing time is preserved in caves, and early human evolution is recorded.

Until now, the lack of dating methods of Cradle fossils has made it difficult for scientists to understand the relationship between homin species in East and South Africa. Moreover, the South African record was generally regarded as undazable compared to East Africa, where volcanic ash layers allowed high-resolution dating.

Professor Andy Herries, author of an author at La Trobe University, Australia, said: nok The South African record is the first time that Africa is the starting point for humans, while the complexity of the caves and the difficulty to date them. The South African record was difficult to interpret. "

Or In this study, we have enabled us to relate the flow stones in the caves as almost the volcanic strata of the Eastern Mediterranean, but also to create different caves and to associate sequences and fossils directly with a regional sequence, “he says.

In 2005, Pickering began dating the Cradle caves as part of Phd research. This new publication is the result of 13 years of work and brings together a team of 10 scientists from South Africa, Australia and the United States. The results highlight Cradle and open up new opportunities for scientists to answer complex questions about human history in the region.

39 Robyn and his team have made a major contribution to our understanding of human evolution, ABD says the head of the Advanced Research Center for Human Paleobiology at the George Washington University in the United States. work.

"This is the most important progress to be made since the discovery of the fossils themselves. The history of the fossils is very important. The value of South African evidence has been multiplied with this exemplary study of the temporal and depositional context."


Legal warning: AAAS and EurekAlert! Not responsible for the accuracy of newsletters sent to EurekAlert! To contribute to the use of institutions or any information through the EurekAlert system.

Source link