Which species and when did the long dildo dinosaur start? More information about the first dinosaurs was found near the Czech border.
Going on the encounter of this millennium, the oldest known dinosaurs were discovered in sediments from the Early Upper Triassic period (roughly before 234 and 225 million years ago).
For a long time, the oldest true dinosaurs were considered to be species known from the Argentine Ischigualasto Formation, dating to about 231.4 million years ago. This concerned, for example, famous species Herrerasaurus ischigualastensis or Eoraptor lunensis, archaic dinosaurs who can’t miss the dnm dinosaur atlas.
This better data revealed that dinosaurs had to be found a little differently. Findings from the Brazilian Santa Maria Formation have been found to be about two million years old on the Ischigualasto in Argentina. The radiometric data set the Brazilian sediment at 233.2 million years.
The oldest known dinosaurs have therefore become species such as Staurikosaurus pricei, Saturnalia Tupiniquim or Buriolestes schultzi. The time of the origin of the dinosaur was thus placed in the geological age of karna (before 237 and 227 million years ago). This was true roughly until 2000.
Then suddenly there was a big change and the origins of the Dinosaur group were shifted back by ten or even fifteen million years. At that time, a prehistoric reptile was discovered in Polish Silesia, which also has an area of its discovery in its name, and this name was pedaled by a large group of archosaurs, who are the closest relatives of true dinosaurs. Name yourself silesauridi and he is that Polish species Silesaurus opolensis, excavated in Krasiejow near Opole (where the author of this text in 2007 and 2010 participated in the excavations).
Silesaurus was first discovered in 2000 and was formally described by paleontologist Jerzy Dzik three years later. This thl reptile walked on upright legs, ml long neck and examine his head. The teeth were stamped and on the edge of the elis was a bone edge, which probably served to market plant food. It was about 2.3 meters long and weighed about 30 kilograms.
If necessary, he could probably stand on the back and fight on the back (so-called bipedn). He lived during the Upper Triassic, about 230 million years ago, was also about the same age as the dinosaurs of the Ischigualasto Formation. Sm was definitely not the ancestor of the group Dinosauria, pesto led paleontologists to the first clue.
Gradually, these discovery and re-identification were given to the representatives of the Silesian jerks, ie silesaurids, from several different continents. It turned out that they were not a rare group of archosaur reptiles, but that, on the contrary, they were known to be born and evolved. They appeared at the Triassic and became extinct, and at its end, they have existed for more than 40 million years.
He gave an interesting discovery of this species of sawflies again from Poland, in 2010, when fossil footprints of three-footprints of a potential dinosauromorph (perhaps a silesauride or even an archaic dinosaur) from layers about 246 million years old were described from the Svatokské Mountains. Some experts doubted what exactly the proper meaning meant, but the silesaurid believed skeptics differently.
Africk is short
In 2010, the skeleton of the plaza, which is today considered to be the oldest known silesauride, was described as a fossil base from Tanzania. He received his name Asilisaurus kongwe and its st in about 247 and 242 million years. The fossils were discovered in the Manda Beds Formation from the Middle Triassic period and belonged to a Silesauride about 1 and 3 meters long, weighing about 30 kilograms.
Developmental fossils of a primitive sauropodomorph of the species Buriolestes schultzi, described in 2016 from the sediment of the Brazilian Santa Maria Formation. Together with several other dinosaurs described from this geological formation, buriolestes is the oldest member of the Dinosaur group, known for its skeletal fossils. Its st in about 233.2 million years.
From the same formation comes the fossil of the next dinosauriform, which was given the scientific name in 2013 Nyasasaurus parringtoni and with around 243 million years, it could be by far the oldest known true dinosaur. Unfortunately, little material was discovered, and we are not sure whether it was a dinosaur, a silesauride, or a development of a primitive dinosaur morph.
Despite this, thanks to African discoveries, we know that dinosaurs must have existed for at least ten million years by two non-Brazilian record holders. The reason is simply because Silesauridae is the group of developers closest to the dinosaur and shared an ancestor with them.
It follows that representatives of both groups of true dinosaurs and Silesian livers must have existed it 245 million years ago. The first small dinosaurs, a modest forerunner of the future rulers of the mainland, therefore appeared at a time when the effects of the greatest extinction in other planets at the end of the Permian and the Triassic were in the early days of 252 million years.
So let’s not forget birds among the dinosaurs, which are undoubtedly a specialized group of teropods, but it is clear that dinosaurs have existed on the planet for about 180 million years.
The text was created for the Dinosaur blog by Vladimír Socha. It was edited before publication, the original can be found here.