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What evidence suggests that a mass extinction of the dinosaurs occurred at the end of the cretaceous?
Wiki User
∙ 10y ago
The Cretaceous period ended as the result of a mass extinction event, probably resulting from an asteroid impact. This wiped out 65 percent of life on earth, including the ammonites, the plesiosaurs, the pterosaurs, and, most famously, the dinosaurs.
Wiki User
∙ 11y ago
Wiki User
∙ 10y agoPrior to the end of the Cretaceous 65.5 million years ago, dinosaur fossils were abundant. After the Cretaceous, there are no dinosaur fossils. This indicates that all dinosaurs died out suddenly in a mass extinction.
Wiki User
∙ 10y agoThe evidence for the mass extinction is that in rocks older than 65.5 million years, dinosaur fossils and fossils of animals such as pterosaurs, mosasaurs, plesiosaurs, and ammonites were common. In rocks younger than 65.5 million years ago, there are absolutely none. Hence, we know that there was a mass extinction that wiped out the above animals.
Wiki User
∙ 10y agoThe fact that dinosaur fossils abruptly disappeared 65.5 million years ago is strong evidence of a major catastrophe. Some dinosaurs had gone extinct at times, but new ones always evolved. To wipe them out, it would have taken a major catastrophe eliminating them quickly. There is a worldwide layer of iridium in the rock layers that date to 65.5 million years ago, which is evidence that a huge asteroid slammed into Earth, because iridium doesn't exist on Earth's surface except from meteorites. There are also impact spherules worldwide, which are tiny bits of ejected, liquid rock that fell back to Earth like rain and cooled on the way down.
Wiki User
∙ 11y agoan absence of dinosaur fossils in Paleocene Bedrock.
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During which period the dinosaurs disappeared on the Earth?
The Cretaceous / Tertiary boundary (KT) occurred 65 million years ago and extinctions of most dinosaurs was probably due to a meteorite impact in the Yucutan peninsular of Mexico known as the Chixulub crater.
When was the last mass extinction?
The Cretaceous–Tertiary extinction event 65 million years ago was the last mass-extinction, and many believe that humans are causing a mass-extinction right now.
How big was the meteor that was said to have led to the extinction of the dinosaurs?
Although there is much speculation over what actually caused the extinction of the dinosaurs, a large meteor did, in fact, strike the Earth shortly before the dinosaurs' extinction. The meteor is believed to have been approximately 10 kilometers in diameter. The impact location was the Yucatan peninsula and the event occurred around 65 million years ago. If the dating is correct this places the impact during Cretaceous period, which has led many to believe that the impact event triggered or facilitated the extinction of the dinosaurs.
Where did the extintion of dinosaurs occurred?
There is no actual place which extinction occurred as dinosaurs are represented on every continent by both extant species and fossil remains.
If the Cretaceous mass extinction had not occurred which group of animals would today probably include the largest land animals?
If the Cretaceous mass extinction had not occurred, reptiles would today be the largest land animal in the world. At the time, reptiles were the largest animal group on Earth.
Did the dinosaurs extinct at once?
No, not all at once. Throughout the 150 million year "reign" of the dinosaurs, all kinds of groups of dinosaurs have flourished then died out. Dinosaurs living in the Triassic Period were not the same as dinosaurs living in the Cretaceous period. However, the final blow to the dinosaurs that caused them all to die out was the K-T mass extinction that occurred 65 million years ago.
What is a sentence using the word extinction?
The moon crashing into the planet would be an extinction level event. The extinction of the dinosaurs occurred long before we were born.
The last mass extinction of dinosaurs on Earth occurred between which two geologic periods?
asteroid attack
What is most likely the approximate age of the rocks in which the dinosaur fossils were found?
Dinosaurs had an extended period of existence on Earth. Rocks associated with their "Age of Dinosaurs" were laid down from the Jurassic (about 201 million years ago) until the end of the Cretaceous (66 million years ago), when the Cretaceous–Paleogene extinction event occurred
What happened at the end of both the mesozoic and palezoic eras?
There were major asteroid impacts. #fuckschool #imheretohelp
What is the k-t mass extinction and when did it occur?
It occurred between the Cretaceous period at the end of the Mesozoic era and the Tertiary period at the beginning of the Cenozoic era. It's mostly known for wiping out the dinosaurs. Any species that weighed over 100 kg vanished (60-80% of all species).
What is a brief period of time in which large numbers of species die out and disappear?
A brief period of time in which large numbers of species die out and disappear is known as a mass extinction event. These events have occurred five times in Earth's history, with the most well-known being the extinction of the dinosaurs at the end of the Cretaceous period.
