2020-11-20

Research discovery:paleontologists found two Titanosaurus fossils in northwestern Argentina

By yqqlm yqqlm

On November 19, the Spanish newspaper”Nation” published the title”Palaeontologists found two species in northwestern Argentina”Fossils of Titanosaurus reported by Federico Cooko. According to the report, in March 2016, Heching Leitner led the archaeological team to the site for the third time. A geologist discovered that the back of a red rock resembled the femur of a dinosaur. Scientists later discovered fossil ribs. Finally, three complete fossils of dinosaur remains buried for 70 million years were found. Fossils of the tail vertebrae show that these are two genus and species of Titanosaurus that are still unknown. The full text is excerpted as follows:

Five years ago, Martin Hechingleitner, an Argentine paleontologist and Titanosaurus researcher, went out to investigate with colleagues, but returned empty-handed. They came to the Santo Domingo Mountains in the Quebrada Mountains near the Andes in La Rioja Province in northwestern Argentina, where the environment is extreme, with an altitude of 3,200 meters and unsuitable for living.

Heichen Leitner said,”We don’t have any information about the excavation site, only some dilapidated and tiny spinal fossils, discovered by an Australian geologist and kept in a small box at a university. , No one cares”. The archaeologists searched the valley for 10 days and found nothing. They were exhausted and ended the expedition.

A few months later, they returned to the field. On the sixth day, their persistence finally paid off-they found a dinosaur egg fossil, and then another nest with 5 fossil eggs in it.

But the greater treasure is still waiting for them to discover. In March 2016, Hexing Leitner led the archaeological team to excavate the site for the third time. A geologist discovered that the back of a red rock resembled a dinosaur’s femur. Researchers hurriedly surveyed and discovered rib fossils. Finally, three complete fossils of dinosaur remains buried for 70 million years were found.

Caudal vertebra fossils show that these are two unknown species of Titanosaurus, living in the end of the Cretaceous, that is to say, they may be the last descendants of these two Titanosaurus.

According to a study published in the journal Biology Communications, the big Titanosaurus was named Cugelin Plateausaurus to illustrate the environment in which it lived and to pay tribute to the earliest dinosaur fossils found in the area The geologist Caughlin, it should be 20 meters long, the other two small Titanosaurus weighing about 3 tons, about 7 meters long, were named Blavaron.

Ancient behemoth

Titansaurus is the largest animal that has ever walked on the earth. It is a herbivorous dinosaur with a wide variety of species and a long neck. Has a complicated evolutionary history. They lived about 145 million years ago to 66 million years ago, and their body fossils are found on all continents, including Antarctica.

But the country where the most species of Titanosaurus fossils have been found so far is Argentina. A total of 35 species have been found. Among them, the largest mayo’s Patago dragon is 37.2 meters long and weighs the same as 10 African elephants. . Hexing Lightner said:”Their size shocked me. I really don’t know how such a large animal performs its biological functions.”

Australian biologist Roger Seymour It is believed that, contrary to most museum restoration models, Titanosaurus may not be able to stand up necks like giraffes, because to stand up necks, the hearts of these animals must be very large in order to pump enough blood to their heads. , So the head of Titanosaurus is likely to be parallel to the ground.

In South America, most of the Titanosaurus fossils were found in ArgentinaPatagonia and southwestern Brazil The Bauru Basin. Archaeological team member and paleontologist Agustin Martinelli said:”Interestingly, we found fossils in La Rioja, which fills the gap between the two fossil regions.” These researchers said. The analysis results show that the two newly discovered Titanosaurus have similar characteristics to the Patagonian dragon and Brazilian Baurusaurus, which further strengthens the The hypothesis that there is a close relationship between the sauropod fauna.

Or used to be an amphibian

At the end of the Cretaceous, Titanosaurus may have been distributed throughout South America, when South America was separated from other lands Of an island. Paleontologists pointed out that Titanosaurus is a social animal, they migrate in groups.

These two types of Titanosaurus, Coughlin Plateausaurus and Blavasaurus, should live in the same place, but they are not as large as the Patago dragon, which lived earlier than them About 30 million years. Hechenleitner said:”We don’t know why such a posture change occurs. It may be that changes in climate and vegetation have caused them to shrink in size. Or because of the emergence of gramineous plants, because animals do not need to eat such plants. Grow up so big.”

The place where the Argentine scientists discovered the new Titanosaurus fossils may have been a river plain in ancient times. The river plain should be the favorite environment of the Cugulin Plateau dragon and Blavaron . Hechenleitner guessed:”We suspect that Titanosaurus was once an amphibian, just like hippo. Hippos are very big animals. Living for a long time by the water or in the water, it is obvious that there are a large number of hippos living and dying in this area.”

The Carnivorous dinosaurs and crocodile tooth fossils. It should be that the remains of Titanosaurus were exposed for a long time, and carrion-eating animals regarded them as delicious meals. (Compile/Wang Lu)

Source:Reference News Network