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The mass extinction of the dinosaurs occured at the end of the Cretaceous Period. There are many theories as to why this happened. Some say a volcanic eruption caused it or a falling meteorite.
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∙ 11y ago
Wiki User
∙ 15y agoThere is evidence that the cause of the Permian mass extinction was extraterrestrial. High concentrations of fullerenes, extraterrestrial helium-3, and ratios of helium and argon which differ from Earth's crustal ratios are found within the sediments of the Permian - Tertiary boundary. Similar fullerenes are found in other known carbonaceous chondrites (meteorites).
Some scientists believe that the Permian mass extinction was ecological. It is hypothesized that gymnosperms replaced spore-bearing ferns in large numbers as a result of the formation of Pangea which led to cooler and drier climates in many area. This rapid change could have devastated the food chain and been the trigger for the mass extinction. Also, many epeiric seas which were the home of many species were drained and equatorial circulation of the ocean was halted as a result of the formation of Pangea. Volcanism which increased carbon dioxide and dust concentrations in the atmosphere was also prevalent in the Permian. An increase in carbon dioxide and dust concentrations in the atmosphere may have led to an ecologically damaging greenhouse effect.
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∙ 14y agothe extinction of the dinosuars
Wiki User
∙ 13y agoThey believe a meteor killed them.
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What Geological Period preceded the Jurassic Period?
after Jurrasic period it is the Cretaceous period
What came after the triassic period?
After the Triassic period, the Jurassic period began, followed by the Cretaceous.
The Cretaceous period was a part of what era?
It was part of the Mesozoic Era.
What did earths surface look like in the cretaceous period?
hot ,wet,
Which of the following is not a geologic period of the Earth Jurassic Cretaceous Triassic Neoprene?
Neoprene
What period was after the cretaceous?
The Paleogene Period followed the Cretaceous.
What Geological Period preceded the Jurassic Period?
after Jurrasic period it is the Cretaceous period
Were people alive in the cretaceous period?
at that time only dinosaurs were alive people were not alive and that age is called ice age time.it only happened in the movie jurrasic park
Were there there fruits in the cretaceous period if so which kind of fruits?
There were a fruit in the cretaceous period. There were berries in this period.
When did Cretaceous period take place?
Mesozoic Era
A timeline of when the dinosaurs where alive?
Dinosaurs have been alive in the Mesozoic Era. The Mesozoic Era consist of three time periods the Triassic, Jurassic, and Cretaceous. The Triassic is the oldest part of the Mesozoic Era. The Cretaceous is the youngest part of the Mesozoic Era. The Triassic period had started 227 million years ago and ended 22 million years later. When the Triassic period ended the Jurassic period started. The Jurassic period started 205 million years ago and ended 61 million years later. After the Jurassic period came the Cretaceous period. The Cretaceous period started 144 million years ago and ended 79 million years later. The dinosaurs have been alive ever since the beginning of the Triassic period and are still alive today. But the dinosaurs that are alive to this day are the evolve creatures of those in the past.
What made the cretaceous period end?
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.
Were there fruits in the cretaceous period if so which kind of fruits?
There were fruits in the cretaceous period. There were berries and bread in this period.
In what period did the Triceratops live?
Triceratops lived in the late cretaceous period.
Were mammoths alive in the cretacous period?
In short, no. The Cretaceous period ended 65.5 million years ago, and mammoths first evolved about 5 million years ago.
Which period is older than the Triassic period?
The Jurassic Period followed the Triassic.
How was the cretaceous period different from the Jurassic period?
The Pangaea split is the difference between the Cretaceous period and the Jurassic period. The split took place in the Jurassic period.
