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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).
Describe where dinosaurs fit into the geologic time scale?
Between 222 million years ago and present, because birds are technically dinosaurs, but traditional dinosaurs died out 65 million years ago.
What do the periods the geologic time scale represent?
Usually, they represent periods between extinction events, where a particular type of lifeform was dominant.
What is the difference between extinction and species endangerment?
Extinction refers to complete eradication of a species such as the Warrah or Dinosaurs (things that no longer exist), whereas an endangered species is merely under threat of eventual extinction, but is not there yet, like a panda or a California Condor.
3 possible contribution of extinction of the dinosaurs between the creatceous and tertiary?
Impact event: The most widely accepted theory is that a large asteroid impact caused drastic environmental changes leading to the extinction of the dinosaurs. Climate change: Volcanic activity and changes in atmospheric composition could have led to significant climate disruption, affecting the food chain and ultimately leading to the extinction of the dinosaurs. Competition and evolution: The rise of new species, particularly mammals, may have outcompeted dinosaurs for resources, leading to their decline and eventual extinction in the Cretaceous-Tertiary boundary.
The epoch spans the time between 65 million and 56 million years ago?
This epoch is known as the Paleogene epoch, which follows the Cretaceous period and precedes the Neogene period. During this time, significant geological and climatic changes occurred, including the extinction of dinosaurs and the rise of mammals.
How many years did the dinisors livE AGO?
Dinosaurs lived between approximately 230 million and 65 million years ago, during the Mesozoic Era, which is divided into the Triassic, Jurassic, and Cretaceous periods. The last dinosaurs disappeared around 65 million years ago, likely due to a mass extinction event. This means that dinosaurs roamed the Earth for about 165 million years before their extinction.
Why don't dinosaurs existed?
They did exist, between around 225-65 million years ago, and were wiped out by the last Mass Extinction Event (summised to be a comet impact).
What happend in the period between dianosur extinction and the appearance of the first humans?
Scientists theorize an ice age or other global event the dinosaurs couldn't adapt to, which wiped them out.
What was the geologic time period of ordovican?
The Ordovican period was in the Paleozoic era, and occurred between 488.3 million years ago and 443.7 million years ago.
Were mastodons alive with the dinosaurs?
No, Mastodons were alive from the late Miocene/early Pliocene until around the end of the Pleistocene, 10,500 years ago give or take. There is nearly 60 million years of time between the extinction of the dinosaurs and the rise of the Mastodon.
A major difference between Catastrophism and Uniformitarianism is?
that Catastrophism proposes that Earth's geological features were mainly formed by sudden, short-lived events such as floods or volcanic eruptions, while Uniformitarianism suggests that these features were shaped over long periods of time by gradual, continuous processes like erosion and sedimentation.
