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 ...
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.
Videos
13:14
The First Minutes The Dinosaurs Went Extinct - YouTube
07:06
Why the Dinosaurs' Extinction is an Ongoing Puzzle | Nat Geo ...
03:10
How Dinosaurs became Extinct | Dinosaur Extinction | Dinosaurs ...
26:04
The Extinction of the Dinosaurs - Everything You Need to Know - ...
00:58
How Did Dinosaurs Actually Go Extinct? - YouTube
Natural History Museum
nhm.ac.uk › discover › dinosaur-extinction.html
What killed the dinosaurs? | Natural History Museum
Find out why most dinosaurs became extinct 66 million years ago at the end of the Cretaceous Period. Birds were the only dinosaurs to survive the mass extinction.
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 ...
June 21, 2023 - Their captivating tale begins in the Triassic period, reaches its peak during the well-known Jurassic period and comes to a dramatic end in the late Cretaceous period. Discover how each of these distinct periods served as a stage for the ...
Wikipedia
en.wikipedia.org › wiki › Dinosaur
Dinosaur - Wikipedia
3 days ago - 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.
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 ...
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
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
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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.
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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.
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.)
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.
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.
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.
Quora
quora.com › How-long-ago-did-the-dinosaurs-exist-and-how-did-they-go-extinct
How long ago did the dinosaurs exist, and how did they go extinct? - Quora
Answer (1 of 2): Most of the Dinosaur went extinct around 66.043 million years ago when a large space rock slammed into the Earth in a shallow marine environment and turned the rock into interesting things like a dilute sulfuric acid vapor.
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
USA Today
usatoday.com › story › news › world › 2022 › 09 › 16 › when-did-dinosaurs-die-go-extinct › 7972994001
When did the dinosaurs go extinct? Theories on how it happened and what survived.
May 22, 2024 - Dinosaurs roamed the earth for 165 million years and went extinct 66 million years ago. These two theories may explain why.
Everything Dinosaur
blog.everythingdinosaur.com › home
Extinction of the Dinosaurs - 66 or 65 Million Years Ago?
October 18, 2022 - Whilst reviewing our extensive ... and with it the termination of the Mesozoic Era, was stated as occurring approximately 65 million years ago....
USGS
usgs.gov › faqs › did-people-and-dinosaurs-live-same-time
Did people and dinosaurs live at the same time? | U.S. Geological Survey
If all of Earth time from the very beginning of the dinosaurs to today were compressed into 365 days (one calendar year), the dinosaurs appeared January 1 and became extinct the third week of September.
Popular Science
popsci.com › science › dinosaurs › june was probably a terrible month to be a dinosaur. here's how we know.
When did dinosaurs go extinct? Fossils give exact timing. | Popular Science
January 27, 2022 - The dinosaurs were killed by a meteorite impact on the Earth some 66 million years ago in what has become known as the Cretaceous-Paleogene extinction event. At what time of the year this occurred has long generated debate among palaeontology ...
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
How did dinosaurs become extinct? Explore the Cretaceous extinction event and the role of the Chicxulub impact in the death of dinosaurs (except birds).
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 - The other theory is massive amounts of lava flow from India, known as the Deccan Traps, occurred around the same 66 million years ago timeline. According to National Geographic, the eruption resulted in volcanic rock covering 200,000 square ...