Scientists say that when an asteroid hit the earth, dinosaurs were not ruined. Fossil address before the asteroid collision, at the end of the Creteshius era, shows that dinosaurs were losing diversity and numbers. At first, some scientists thought that this change showed that dinosaurs were moving towards extinction even before the deadly asteroid phenomenon. Nevertheless, this concept has been logical for a long time, other researchers stressed that dinosaur diversity was fixing at the time of loss of their lives.
Challenge a long -held story
according to a Report By Live Science, the visual rarity of dinosaurs before his extinction can only be due to low fossil records. Enchazizsng four families- ie, ankylosauridae, cetopsidae, hadrosauridae, and Tyrannosauridae- The study of scientists revealed a record of about 8,000 fossils from North America, which has revealed a record of about 8,000 fossils from North America, which is from 72.6 million to 72.1 million) (72.1 million from 72.1 million) (72.1 million from 72.1 million) First) are.
The thin range of dinosaurs was at its peak 76 million years ago and began to shrink after wiping the asteroid collision with Nonwian Dinosaur. This flow was more pronounced than 6 million years before the mass destruction, with the number of fossils that reduce fossils of all four families.
Fossil records and statistical models paint a new photo
The vegetation either covered or uncovered geological outflows from the mastrichian period in North America. In particular, from this time, rocksor fossils that could include fossils were not easily accessible to researchers who were looking for them. Due to the half -part of the familiar fossils of this era, the ecceuation of the study can also have a branch worldwide.
A terrible exception, not a gradual end
There is no evidence of environmental conditions or other aspects that would especially expand the cause of this decline, the researchers landed. All the broods of the dinosaurs were from far-flung, as being developed by researchers according to the model-and as a result, at a low risk to extinct, preventing an asteroid effect such as a frightening phenomenon.
The 8,000 fossil records were evaluated, the team found that the Seratopsian – a group consisting of horny dinosaurs such as trystops and its relatives – the most common; Most likely, they were inhabited in plain areas which were most favorable for conservation during the mastrichian era.
