Long-necked dinosaurs migrated hundreds of kilometers across what is now the American Midwest during the Jurassic period.
How did the researchers figure out that these giant beasts migrated? The fact is that one of the long-necked dinosaurs swallowed pink stones in what is now Wisconsin, USA, and then died in the Wyoming area, leaving the tour in a new place. Let us remind you that gastroliths or stomach stones are fragments of minerals and rocks swallowed by animals with a relatively weak dental system, mostly well polished after being in the digestive organs. Animals swallowed samples of the breed to grind food in the stomach.
The new discovery is one of the proofs of the migration of Nonavian dinosaurs. Incidentally, this is the first study of its kind to use gastroliths as an indicator of dinosaur migration.
Geologists already know that rose quartzite, like the samples found in Wyoming, is found in only a few locations throughout North America, including Idaho, Montana, New Mexico, and Wisconsin. Having determined the age of the zircons in the quartzite samples, the scientists compared the stones with the already dated pink quartzite all over the continent.
According to the researchers, there was no river connecting Wisconsin with Wyoming that flowed with enough energy to carry such large stones over such a distance.
Recall that the Jurassic period is the middle (second) period of the Mesozoic era. It began 201.3 ± 0.2 million years ago and ended 145.0 million years ago. Thus, it lasted for about 56 million years. The complex of sediments (rocks) corresponding to a given age is called the Jurassic system. In different regions of the planet, these deposits differ in composition, genesis, and appearance.