extinction event ending the Mesozoic Era
Factsheet
Named after Cretaceous
Paleogene
Paleogene
Named after Cretaceous
Paleogene
Paleogene
Wikipedia
en.wikipedia.org › wiki › Cretaceous–Paleogene_extinction_event
Cretaceous–Paleogene extinction event - Wikipedia
3 days ago - Scientists agree that all non-avian dinosaurs became extinct at the K–Pg boundary. There is no evidence that late Maastrichtian non-avian dinosaurs could burrow, swim, or dive, which suggests they were unable to shelter themselves from the worst parts of any environmental stress that occurred at the K–Pg boundary. It is possible that small dinosaurs (other than birds) did survive, but they would have been deprived of food, as herbivorous dinosaurs would have found plant material scarce and carnivores would have quickly found prey in short supply.
Wikipedia
en.wikipedia.org › wiki › Dinosaur
Dinosaur - Wikipedia
3 days ago - They first appeared during the ... active research. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201.3 mya and their dominance continued throughout the Jurassic and Cretaceous periods....
Videos
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USGS
usgs.gov › faqs › when-did-dinosaurs-become-extinct
When did dinosaurs become extinct? | U.S. Geological Survey
Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years. If all of Earth time from the very beginning of the dinosaurs to today were compressed into 365 days ...
Natural History Museum
nhm.ac.uk › discover › dinosaur-extinction.html
What killed the dinosaurs? | Natural History Museum
Strong evidence suggests that a huge asteroid impact caused the mass dinosaur extinction 66 million years ago.
National Geographic
nationalgeographic.com › home › science › why did the dinosaurs go extinct?
Why did the dinosaurs go extinct?
Learn about the mass extinction event 66 million years ago and the evidence for what ended the age of the dinosaurs.
Published May 4, 2021
American Museum of Natural History
amnh.org › exhibitions › dinosaurs-ancient-fossils › extinction
Mass Extinction on Earth, 65M Years Ago: What Happened? | AMNH
Article Volcanoes Some researchers think that intense volcanism could have contributed to the dinosaurs' decline well before a comet or asteroid impact... Article End of an Era Our view of the mass extinction 65 million years ago is somewhat ...
Natural History Museum
nhm.ac.uk › discover › how-an-asteroid-caused-extinction-of-dinosaurs.html
How an asteroid ended the age of the dinosaurs | Natural History Museum
Ammonites were just one of the groups of animals to die out during the Cretaceous-Palaeogene extinction event, 66 million years ago. The last non-bird dinosaurs were living at a time of environmental change, some of which began millions of years ...
Reddit
reddit.com › r/paleontology › when did the dinosaurs go extinct... exactly?
r/Paleontology on Reddit: When did the dinosaurs go extinct... exactly?
January 4, 2024 -
Some questions I've been tinking about.
How quickly did every last dinosaur go extinct? Were there many species of dinosaur that held on multi generationally, if so for how long? Is there, or would there ever be evidence of dinosaurs more recent than 66 mya? Was there any part of earth that was kinda okay-ish for any amount of time after the impact?
Dinosaur nerds, help me here please.
Edit: yes I know about the origin of birds thank you, I shouldn't have clarify 'non-avian' dinosaurs because we all know.
Thank you all for your responses, I got quite a lot. It was more of a discussion than anything, and a question as to what we do currently know and what we could possibly know.
Thanks everybody
Top answer 1 of 26
93
There are no dinosaur fossils found above the K-T line. Unless....you count birds and most people these days do. There is no way to know how many 'generations' it took for them to completely go extinct as dating techniques have a large enough fudge factor, that you are probably looking at hundreds within that fudge. They can narrow this down by using multiple techniques, but you'd still be looking at several hundred thousand years of variance.
2 of 26
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We can give estimates to the million years mark, but as of now we don’t have the technology to go as specific as generations. Birds are still around so a branch of Dinosaurs do still live on.
Encyclopedia Britannica
britannica.com › science › earth science, geologic time & fossils › dinosaurs
How Long Did Dinosaurs Live? | Extinct, Time Span, & Facts | Britannica
June 20, 2025 - Dinosaurs roamed the Earth for an impressive span of about 165 to 180 million years. They perished in a mass extinction event about 66 million years ago.
Discover Magazine
discovermagazine.com › home › the sciences › a complete dinosaur timeline to extinction: how long did they roam earth?
A Complete Dinosaur Timeline to Extinction: How Long Did They Roam Earth? | Discover Magazine
June 21, 2023 - The dawn of dinosaurs began with the Permian mass extinction, also known as the Great Dying.
USGS
pubs.usgs.gov › gip › dinosaurs › extinct.html
When Did Dinosaurs Become Extinct?
If all of Earth time from the very beginning of the dinosaurs to today were compressed into 365 days (1 calendar year), the dinosaurs appeared January 1 and became extinct the third week of September. (Using this same time scale, the Earth would have formed approximately 18.5 years earlier.)
Britannica
britannica.com › science › earth science, geologic time & fossils › dinosaurs
Dinosaur - Extinction Causes, Evidence, & Theory | Britannica
July 26, 1999 - Dinosaur - Extinction Causes, Evidence, & Theory: The mass extinction of dinosaurs 66 million years ago remains a misconception; the fossil record shows that dinosaurs were already in decline during the late Cretaceous.
New Scientist
newscientist.com › question › dinosaurs-go-extinct
When did the dinosaurs go extinct? | New Scientist
For the next 10 million years the world belonged to these little-known animals, with dinosaurs playing bit parts. Then along came the Triassic–Jurassic mass extinction of 200 million years ago.
Dinosaur World Live
dinosaurworldlive.com › blog › top-reasons-why-dinosaurs-became-extinct
TOP REASONS WHY DINOSAURS BECAME EXTINCT
Around 70 million years ago – some four to five million years before the mass extinction event – there seems to have been a lot of violent volcanic activity in northern India. The theory is that over tens of thousands of years, the dust and ash that entered the atmosphere slowly became ...
PubMed Central
pmc.ncbi.nlm.nih.gov › articles › PMC6425225
Why did the dinosaurs become extinct? Could cholecalciferol (vitamin D3) deficiency be the answer? - PMC
Geological evidence indicates that dinosaurs became extinct at the boundary between the Cretaceous and Paleogene eras, about 66 million years ago, at a time when there was worldwide environmental change resulting from the impact of a large celestial object with the Earth and/or from vast volcanic ...
HISTORY
history.com › home › articles › why did the dinosaurs die out? - causes & dates
Why Did the Dinosaurs Die Out? - Causes & Dates
The Cretaceous-Tertiary extinction event, or the K-T event, is the name given to the die-off of the dinosaurs and other species that took place some 65.5 million years ago. For many years, paleontologists believed this event was caused by climate ...
Published May 28, 2025
Nature
nature.com › nature communications › articles › article
Dinosaur biodiversity declined well before the asteroid impact, influenced by ecological and environmental pressures | Nature Communications
June 29, 2021 - Dinosaurs are thought to have been driven extinct by an asteroid impact 66 million years ago. Here, Condamine et al. show that six major dinosaur families were already in decline in the preceding 10 million years, possibly due to global cooling ...
UCMP
ucmp.berkeley.edu › diapsids › extinction.html
What Killed The Dinosaurs?
Surely ever since the first fossils of obviously extinct animals were found, humankind has wondered: "Why did they die?" A poignant question, for it has relevance to us if extinct animals were wiped out by some catastrophe, couldn't that just as easily happen to us?
Science
science.org › content › article › when-dinosaurs-went-extinct-many-animals-literally-came-out-dark
When dinosaurs went extinct, many animals literally came out of the dark | Science | AAAS
The first ancestral mammal species to be active in the daytime probably lived around 65.8 million years ago—just 200,000 years after the mass extinction that wiped out all dinosaurs except birds, the team reports today in Nature Ecology and ...
Phys.org
phys.org › news › 2022-09-dinosaurs-extinct-theories-survived.html
When did dinosaurs go extinct? The theories on how it happened and what survived
September 16, 2022 - According to National Geographic, dinosaurs went extinct about 66 million years ago.