New research on the University of London and the Natural History of the UK, the world’s first dinosaur ancient fossils can be buried in places where surveys are almost impossible.
The oldest dinosaur fossils currently recorded It dates back about 230 million years ago. These specimens have been collected from the former part of Gondwana (the southern half of the super continent pangea in the late old life) and occupied a relatively distant branch of the Dino family tree. It suggests that it is distributed all over the world.
Furthermore, discovery Dinosaur at the same time What was the north land of Super Continton? LaLacia has only improved the understanding of the history of dinosaurs.
Be convinced The true origin of dinosaurs has not been tracked yet. Anti -biologist suspects that the starting point of all the “terrible lizards” may be hidden in some of the most difficult places on the earth.
There is a big gap between the recording around the equator during each hemisphere claim for the early fossils. In a place where the dinosaur fossils were not found, it is easy to assume that there is no dinosaur, but it may not always be.
The conditions must be right for fossils to be saved in the first place. for Trace fossilsLike a footprint, it must be filled with loose sand in traces of soft mud and then compressed. In order for fossils of the body to be formed, animal corpses must be covered with mud or silt immediately after death. Please do not rot Completely.
However, even if a complete fossil is formed, it is not always possible to find it, especially in places where it is difficult to reach. In a new paper led by Joel Heath, an old -time student of University College London, the author pointed out that Amazon and Sahara’s old -fashioned expeditions were not particularly common.
And that’s a problem. This is because they doubt that they could find the older history of dinosaurs.
“The old -fashioned expedition to these areas may not be very common as a result of the harsh environment of Sahara and the incapability of many Amazon access.” write。
“In addition, it has been well documented that social economic factors and colonial heritage are likely to hinder research efforts in these regions, combined with political instability.”
In their research, they used the known dinosaur fossils, dinosaurs and their reptile’s parent, Relative, and the geography of the era, to model the radiation of dinosaurs. Rather than assuming that a fossil place is equal to a place without dinosaurs, these areas have been classified as lacking information.
And we did not know exactly how the oldest known dinosaurs were related to each other, so we modeled three different scenarios based on the proposed evolutional trees.
The origin of low -illumination gondwana, which could be proven by Sahara and Amazon, was most strongly supported by the ancestors, Syraesaurus, which is considered to be more dinosaurs than dinosaurs. OrnithiSchian dinosaur.
ORNITHISCHIANS is one of the three major dinosaur groups that are strangely lacking in the early dinosaur fossils, but they are Sillesaurus so that their ancestors fill part of the gap.
Conveniently, low latitude gondwana is also an intermediate point of the early dinosaur fossils of the current record.
“So far, no dinosaur fossils have been found in Africa and South America, which once formed this part of Gondwana.” say。
“However, this may be because the researchers have not yet come across the right rocks because they are relatively lacking in research efforts with those without the ability in these fields.”
These survey results were published Current biology。
