Dinosaurs how long ago

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. Helens erupted on May 18, , and several times after that in the succeeding months. Geologists can point to certain rock layers and tell the exact date when that whole rock layer formed, and approximately how many hours it took to form.

Individual rock layers represent hours of time. The junction between rock layers represent weeks or months between eruptions. There is no way to tell how long it was between Mount St. Helens eruptions from the rock layers alone. Geologists need the historical observations to tell them when each layer formed. Geologists have a fighting chance of estimating the duration of each eruption because there is something to analyze.

They can measure roughly the total amount of ash or lava produced by an eruption. They can estimate the amount of ash or lava produced per minute during a typical eruption, and can come up with a reasonable estimate of how long the eruption lasted. The accuracy of their estimate depends upon how well they measured the amount of volcanic material produced, and their estimate of the rate at which the volcano produced it.

The estimate may be good or bad, but at least they have something to base the estimate upon. There is nothing in the rock that tells them the amount of time between eruptions.

That is, no rock was produced between the eruptions, so there is nothing to analyze. The fundamental problem is that the time between eruptions of Mount St. Helens was longer than the duration of each eruption. Therefore, the bulk of the time is represented by the nothing that is between the rock layers, not the something that is in the rock layers.

Geologists are coming to the consensus that fossil-bearing rock layers were produced rapidly, and that there were unknown periods of time between the rock layers. Geologists have given traditional dates to sedimentary rock layers. They do that based upon the kind of fossils found in the rocks, and the evolutionary assumptions of the stages through which life evolved, and how long it took to evolve through each stage.

I lived in Cincinnati, Ohio, from through Apparently, the Cincinnati Reds were just waiting for me to leave town to win the pennant. Back in those days, I can remember hearing reports on the radio that the Ohio River flooded parts of Cincinnati practically every spring. One of my coworkers was killed when a flash flood washed her car off that section of California Highway 14 and Highway about 12 miles west of Ridgecrest.

The flood that killed my friend probably also buried some lizards, snakes, and maybe some rabbits and coyotes. That same year the Ohio River probably flooded near Cincinnati and probably buried some critters, too, but I am betting none of them were lizards or coyotes. If you make the assumption, as evolutionists do, that the kinds of critters buried in a sedimentary rock layer determine when that rock layer was formed, then you would assume that the Mojave Desert flood and Ohio River flood happened at different times because the Mojave Desert flood contained lizards and coyotes not found in the Ohio River flood.

The fossils in a sedimentary rock layer tell you what kind of critters were living in that area at the time they were buried by a flood, landslide, or sandstorm. The dating and correlation of the geologic column is based on the assumption that all the wildlife living all over the world is the same at any given time. Therefore, floods, landslides, and sandstorms that occur in North America, South America, Africa, Europe, and Asia, will all bury the same kind of critter in any given year.

Dinosaurs were said to have lived million to 65 million years ago because their bones are found in rocks that are said to be Triassic, Jurassic, or Cretaceous. Rocks are classified as Triassic, Jurassic, or Cretaceous because they contain fossils that evolutionists presume were alive all over the Earth only during those periods of time.

If you found a rock with a dinosaur bone in it, you would not be able to convince an evolutionary geologist that it was anything other than a Triassic, Jurassic, or Cretaceous rock. If radioisotope dating indicated the rock was less than 65 million years old, or more than million year old, the evolutionist would flatly reject the radioisotope date.

It is a fundamental article of faith that dinosaurs lived to 65 million years ago. Since dinosaurs supposedly died out 65 million years ago, it is not possible that anyone in historic times has ever seen a living dinosaur. But what if people have seen living dinosaurs? For that reason, it is worth evaluating the evidence that man and dinosaurs might have lived together. Tyrannosaurus or Triceratops and each genus into one or more species.

Some dinosaurs were bipedal, which means they walked on two legs. Some walked on four legs quadrupedal , and some were able to switch between these two walking styles. Some dinosaurs were covered with a type of body armor, and some probably had feathers, like their modern bird relatives.

Some moved quickly, while others were lumbering and slow. Most dinosaurs were herbivores, or plant-eaters, but some were carnivorous and hunted or scavenged other dinosaurs in order to survive. Pangaea began to break apart into separate continents during the Early Jurassic Period around million years ago , and dinosaurs would have seen great changes in the world in which they lived over the course of their existence.

Dinosaurs mysteriously disappeared at the end of the Cretaceous Period, around 65 million years ago. Many other types of animals, as well as many species of plants, died out around the same time, and numerous competing theories exist as to what caused this mass extinction.

In addition to the great volcanic or tectonic activity that was occurring around that time, scientists have also discovered that a giant asteroid hit Earth about Despite the fact that dinosaurs no longer walk the Earth as they did during the Mesozoic Era, unmistakable traces of these enormous reptiles can be identified in their modern-day descendants: birds.

Dinosaurs also live on in the study of paleontology, and new information about them is constantly being uncovered. Finally, judging from their frequent appearances in the movies and on television, dinosaurs have a firm hold in the popular imagination, one realm in which they show no danger of becoming extinct. Question: When did dinosaurs exist on the earth? Were they still living after God made man?

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