Dinosaurs

A very interesting question. Not a place where we could live, according to this extract from Wikipedia:

http://en.wikipedia.org/wiki/Precambrian

"The atmosphere of the early Earth is poorly known, but it is thought to have been smothered in reducing gases, containing very little free oxygen. The young planet had a reddish tint, and its seas were thought to be olive green. Many materials with insoluble oxides appear to have been present in the oceans for hundreds of millions of years after the Earth's formation.

When evolving life forms developed photosynthesis, oxygen began to be produced in large quantities, causing an ecological crisis sometimes called the Oxygen Catastrophe. The oxygen was immediately tied up in chemical reactions, primarily with iron, until the supply of oxidizable surfaces ran out. After that the modern high-oxygen atmosphere developed. Older rocks contain massive banded iron formations that were apparently laid down as iron and oxygen first combined."

There is more information if you follow the link

andrea

It is not known what the last non-avian dinosaur to die was as these creatures were wiped out in a cataclysmic event in a time period too short for scientists to tell which species died last. Among the last and best known were Tyrannosaurus and Triceratops.

It should also be noted that many paleontologists classify birds as the only surviving dinosaurs, so in that sense many extinctions of recent years would count.

Giganotosaurus carolinii, found in Patagonia, was the largest theropod found TO DATE. The largest specimen found was roughly 14.2 metres long, and weighed 7-8 tonnes (metric).

Although Spinosaurus aegypticus was longer (at between 15-18 metres long), it did not weigh as much as Giganotosaurus. Spinosaurus's build does not indicate a very heavy animal.

The Jurassic period ended 145+/- 4 million years ago. It took place between the Triassic period and the Cretaceous period.

Tyrannosaurus rex lived between 68 and 65.5 million years ago. That was during the Maastrichtian stage, which was the last stage of the Cretaceous period. The Cretaceous period was the last period of the Mesozoic era.

Theropods are lizard hipped, bipedal dinosaurs with three clawed toes that touched the ground (many had a fourth toe that didn't reach the ground called a dewclaw). Most of them, with the exclusion of birds, were meat eaters.

the triceratops ( try .sir .uh .tops ) enemies were tyrannosaurus Rex (ty.ran.oh.s awr. us. rex) and the albertosaurua (al.bert oh sawr us ) thak you for using lol is lol

The mesosaurus dinosaur was actually very small, roughly 3 feet in length, which is 0.9144 meters. The correct pronunciation is mezz-owe-sore-uss.

They did have a wishbone. Also a T-Rex, Velociraptor, and Allosaurus

Well, in 1927, Gerhard Heilmann first discussed the idea that dinosaurs evolved

into birds, however, this idea was discredited during the time, because no fossilized evidence of wishbones were present in theropodic dinosaur fossils, unlike birds. However, in the 1970s, collar and wishbones were found in theropods, such as the dromaeosaurs (raptors) and tyrannosaurs, creating the modern view of dinosaurs evolution into birds.

The universe started 13.8 billion years ago, Earth formed 4.5 billion years ago, and dinosaurs lived from 230 to 65 million years ago. If a billion years was an hour, a minute would be 17 million years, then dinosaurs lived from 13.5 to 3.8 minutes ago. So, from a geological prospective, dinosaurs did not live very long ago.

Way back in 1676, Robert Plot, the curator of an English museum, described and drew a thigh bone that he believed belonged to a giant man. Although that fossil disappeared without a trace, the surviving illustration suggests that it may well have been part of a "Megalosaurus." Later, in 1822, large teeth discovered in England by Mary Ann Mantell and her husband, Gideon, were thought to be the remains of a huge and extinct iguana. It wasn't until 1841 that British scientist Richard Owen came to realize that such fossils were distinct from the teeth or bones of any living creature. The ancient animals were so different, in fact, that they deserved their own name. So Owen dubbed the group "Dinosauria," which means "terrible lizards."

During the Mesozoic Era, which spanned from about 252 to 66 million years ago, the continents were positioned very differently than today. They were primarily grouped into two supercontinents: Laurasia in the northern hemisphere (comprising North America, Europe, and Asia) and Gondwana in the southern hemisphere (including South America, Africa, Antarctica, Australia, and the Indian subcontinent). Throughout the era, these landmasses gradually drifted apart due to plate tectonics, leading to the formation of the Atlantic Ocean and significant changes in climate and biodiversity.

Yes. They were surely not plants, rocks, dirt, or anything like that. :-)

Much the same things that herbivorous animals eat today, with the exception of grass, which, while scientists now think it existed in dinosaur times, didn't become the extensive ground cover we know today until after they'd gone. The big sauropods browsed on coniferous trees like firs and pines, but during the Cretaceous deciduous tree appeared, so the later beasties could have munched on acorns, walnuts and the forerunners of apples and pears. Many species of flowering plants have toxins, so there would have been a lot of experimenting and adjusting to the new diet.
Herbivorous dinosaurs ate a wide variety of plants. Some of the larger Jurassic dinosaurs are known to have fed primarily on podocarp and araucaria forests. Podocarps are conifers.

no. Someone living 150 years ago woudnt know the word monorail

The isolation of South America from the northern continents 144 million years ago. carnotaurs was first described in 1985 by Argentinian dinosaur expert J.F Bonaparte from a sole complete skeleton of the only species found in Late Cretaceous strata of Patagonia

probably

big sauropods probably groaned and moaned to each other

Big Meat eaters like T. Rex probably did what they did in movies: RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRROOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAARRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Raptors had large braincases, and are believed to have distinct calling systems like hisses and screeches and barks and growls.

The Jurassic period extended from 200 million BCE to 146 million years BCE. It lasted 54 million years.

"T-Rex" means tyrannosaurus Rex. T-Rex appeared during the beginning of Jurassic about 205 million years ago just after the End Triassic mass extinction. They lived for 140 million years during the entire Jurassic and Cretaceous Period. During the Mesozoic Era, the only time T-Rex didn't exist is during Triassic period.

Based on what palaeontologists found on the fossils of these great ancient alligators, it's estimated the deinosuchus may have reached around 10 meters (or around 33 feet) in length. The fact that these prehistoric gators may have grown to much longer lengths (such as 12 or even past 15 metres) is unfounded due to lack of adequate fossil evidence.

California was under a shallow sea during the time that dinosaurs lived. Dinosaurs lived on land, so none lived in California.

We cannot be certain of the coloring of any dinosaurs. We have hints from a few skin impressions, and trace chemical signatures left behind, and from the colors of modern birds and reptiles.

Corythosaurus was a late Cretaceous hadrosaur (duck-billed dinosaur). We DO have a few skin impressions of this particular dinosaur, but it remains anyone's guess what the coloring of the magnificent beast would have been.

Animals walk on four legs because it is more stable than walking on two legs. Dinosaurs were very large, and it would have taken a lot of energy for them to walk on two legs. The ones who did walk on two legs were usually predators (like Tyrannosaurus rex or velociraptor) because they could get more energy from eating other animals than from eating plants.