When was dinosaur extinction

Where did dinosaurs live? Dinosaurs lived on all of the continents. At the beginning of the age of dinosaurs during the Triassic Period, about million years ago , the continents were arranged together as a single supercontinent called Pangea.

During the million years of dinosaur existence this supercontinent slowly broke apart. Its pieces then spread across the Why did some dinosaurs grow so big?

Paleontologists don't know for certain, but perhaps a large body size protected them from most predators, helped to regulate internal body temperature, or let them reach new sources of food some probably browsed treetops, as giraffes do today. No modern animals except whales are even close in size to the largest dinosaurs; therefore, What was Pangea?

They all existed as a single continent called Pangea. Pangea first began to be torn apart when a three-pronged fissure grew between Africa, South America, and North Were dinosaurs warm-blooded or cold-blooded? Scientists have conflicting opinions on this subject. Some paleontologists think that all dinosaurs were 'warm-blooded' in the same sense that modern birds and mammals are: that is, they had rapid metabolic rates.

Other scientists think it unlikely that any dinosaur could have had a rapid metabolic rate. Some scientists think that very big Did people and dinosaurs live at the same time? After the dinosaurs died out, nearly 65 million years passed before people appeared on Earth. However, small mammals including shrew-sized primates were alive at the time of the dinosaurs.

Many scientists who study dinosaurs vertebrate paleontologists now think that birds are direct descendants of one line of carnivorous dinosaurs, and Did all the dinosaurs live together, and at the same time?

Dinosaur communities were separated by both time and geography. Different dinosaur species lived during each of these three periods. For example, the Jurassic dinosaur Stegosaurus had already been extinct Do any mass extinctions correlate with magnetic reversals? There is no evidence of a correlation between mass extinctions and magnetic pole reversals. Can USGS photos of fossils be downloaded or viewed online?

Fossil photos can also be viewed as published plates within many online USGS publications. The best keywords for searches are author names, such as William Cobban, Norm Filter Total Items: Year Published: Divisions of geologic time Bookmark DescriptionThis bookmark presents information that is widely sought by educators and students.

View Citation. Geological Survey, , Divisions of geologic time ver. Year Published: Why Study Paleoclimate? Why Study Paleoclimate? Year Published: Divisions of Geologic Time—Major Chronostratigraphic and Geochronologic Units Effective communication in the geosciences requires consistent uses of stratigraphic nomenclature, especially divisions of geologic time. Geological Survey Geologic Names Committee. Animals Wild Cities Wild parakeets have taken a liking to London Love them or hate them, there's no denying their growing numbers have added an explosion of color to the city's streets.

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Science Why it's so hard to treat pain in infants. Science The controversial sale of 'Big John,' the world's largest Triceratops. Find out what Museum scientists are revealing about how dinosaurs looked, lived and behaved. Explore the age of the dinosaurs, from the time they first appeared to the mass extinction 66 million years ago. Is a mosquito trapped in amber really the way to bring dinosaurs back from the dead? Get email updates about our news, science, exhibitions, events, products, services and fundraising activities.

You must be over the age of Privacy notice. Smart cookie preferences. Change cookie preferences Accept all cookies. Skip to content. Read later. You don't have any saved articles. By Sam Rae and Lisa Hendry. What caused the Cretaceous extinction? Read more about what caused the extinction of the dinosaurs.