Coarse, in ancient times, the vastness of palaentologists Australia is an unforgiving place.
The gains are much richer in the more mountainous and rocky world, a difference highlighted by the research often abundant in places like Wyoming and Utah.
The new paper researchers Morrison basin to the western United States, is an indication theories, even the huge dinosaurs roamed over long distances.
Researchers led by Professor Henry Fricke, President of Geology, Colorado College, to investigate the enamel off your teeth, which were chewing up the last 160 million years ago, and today published their findings in Nature.
The teeth belonged to specimens Camarasaurus sauropod, an herbivore late Jurassic, which could weigh 47 tons and grow to 23 feet in length.
Fricke team has measured the oxygen isotopes in the enamel. As the teeth of the sauropods grew up in his youth, drinking water, the animals would leave its trace isotope ratios. Water would also leave its mark in the stones, so comparing the two, the researchers were able to say how the remains, where they drank the water in his youth. Distances up to 300 km distance from the highlands Morrison Basin, Utah and Wyoming.
The search can be much more difficult for paleontologists, Australia, where conditions are far from ideal.
Professor Patricia Vickers-Rich, a paleontologist and director of the Monash Science Centre, explained some problems to work on this continent.
"In Australia we have a lot of things. It is very difficult to find this material [fossil]," said Professor Vickers-Smith, who has a special interest in polar dinosaurs in Australia.
"We worked on these polar dinosaurs in 30 years to get what we had, and I think the last calculation, we have over 30 years we have managed to find about 18,000 bones, you can do something with - and that does not give sufficient information. They are fragmented and difficult to find, and it's just very difficult, "she said.
The mountains and rocky outcrops are ideal for fossils, and their sides and sections can display fossils. However, the great south land of a relative shortage of land formations.
"Australia is a continent very flat for a very long time, and do not have much in the way of outcrops in the Cretaceous (145 million years to 65 million years ago] and early Tertiary [about 65 million years]. Output recording in the early Tertiary, which is the registration fee after the dinosaurs went extinct, is almost nonexistent, because there are things, "he said.
Asked if Australia was sub-study, Professor Vickers-Rich said it was more a case of "less-mapping".
"We need to study more and more of these sites. There are many remote areas that we simply do not put in, but also it is under-geologised in the sense that we do not outcrops here, as we do in Canada or South America or Asia. You are going to Mongolia, and you can go for hundreds and hundreds of miles and there are just outcrops [all] with fossils in them, and there are mountains there, pushing things and you can see long sequences of fossils in them, "she said.
"But here are our mountains on the east coast, where they are covered with trees -. So you can not really find much if you go inside, there are no mountains and very little topography and many of its covered with sand - the dinosaurs fossils in the rocks, which are underground, and you can not see, "she said.
"We regret the topography and trees unlucky in places where you could find stuff - it's just overgrown Watch in Mongolia, it is not true in western Argentina, no matter -.. Do you have a wide range of mountain and you have a lot of dry arid areas, where things can go out and crop research, "he said.
"You must come with exposure and ou have to occur in dry areas. For paleontologists, when you have the mountains of the tropics are not widely used because they are covered with beautiful vegetation - we all want - but if you are a geologist who want to see the rock, so you have to go to career breaks or a river, "he said.
Many Australian dinosaurs fossils are hidden under the earth, but many also destroyed some of the elements that define the landscape.
For more information related to dinosaurs, visit rareresource.com.
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