clade of archosaurian reptiles (Archosauria)
Wikipedia
en.wikipedia.org › wiki › Dinosaur
Dinosaur - Wikipedia
5 days ago - They first appeared during the Triassic period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the evolution of dinosaurs is a subject of active research. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event ...
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 - Fossils, scientific discoveries and tireless research efforts have gradually unveiled the mesmerizing tapestry of the dinosaur timeline. 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 evolutionary dramas that unfolded, as new species emerged and others faded away. The dawn of dinosaurs began with the Permian mass extinction, also known as the Great Dying.
Videos
02:27
What Happened to the Dinosaurs? | CBC Kids - YouTube
What Caused The Dinosaurs To Go Extinct? | Here's what you ...
26:04
The Extinction of the Dinosaurs - Everything You Need to Know - ...
13:14
The First Minutes The Dinosaurs Went Extinct - YouTube
48:00
How The Dinosaurs Became Extinct From An Asteroid Strike | ...
03:55
What Exactly Killed The Dinosaurs? | Earth | BBC Earth Science ...
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
usgs.gov › faqs › when-did-dinosaurs-become-extinct
When did dinosaurs become extinct? | U.S. Geological Survey
Share sensitive information only on official, secure websites. ... Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years.
Wikipedia
en.wikipedia.org › wiki › Cretaceous–Paleogene_extinction_event
Cretaceous–Paleogene extinction event - Wikipedia
5 days ago - The Cretaceous–Paleogene (K–Pg) extinction event, formerly known as the Cretaceous-Tertiary (K–T) extinction event, was a major mass extinction of three-quarters of the plant and animal species on Earth approximately 66 million years ago.
Natural History Museum
nhm.ac.uk › discover › dinosaur-extinction.html
What killed the dinosaurs? | Natural History Museum
Discover more about what caused ... to find out. ... Explore the age of the dinosaurs, from the time they first appeared to the mass extinction 66 million years ago....
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.
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 ...
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. ... Abundant fossil bones, teeth, trackways, and other hard evidence have revealed that Earth was the domain of the dinosaurs ...
Published May 4, 2021
Yale News
news.yale.edu › 2011 › 07 › 12 › last-dinosaur-mass-extinction-discovered
Last dinosaur before mass extinction discovered | Yale News
October 6, 2024 - The seeming anomaly has come to be known as the “three-meter gap.” Until now, this gap has caused some paleontologists to question whether the non-avian dinosaurs of the era — which included Tyrannosaurus rex, Triceratops, Torosaurus and the duckbilled dinosaurs — gradually went extinct sometime before the meteor struck.
Wikipedia
en.wikipedia.org › wiki › Timeline_of_Cretaceous–Paleogene_extinction_event_research
Timeline of Cretaceous–Paleogene extinction event research - ...
November 2, 2025 - A study shows that, contrary to widespread belief, body sizes of mammal extinction survivors of the extinction event were the first to evolutionarily increase, with brain sizes increasing only later in the Eocene. The first known dinosaur fossil linked to the very day of the Chicxulub impact studied by paleontologists at the Tanis site in North Dakota is reported, with the first reports about the site being from 2019.
HISTORY
history.com › home › articles › dinosaurs - extinction, timeline & definition
Dinosaurs - Extinction, Timeline & Definition
June 27, 2025 - Pangaea began to break apart into separate continents during the Early Jurassic Period (around 200 million years ago), and dinosaurs would have seen great changes in the world in which they lived over the course of their existence.
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
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 ...
New Scientist
newscientist.com › question › dinosaurs-go-extinct
When did the dinosaurs go extinct? | New Scientist
The Triassic period in which they first evolved was seen as little more than a dress rehearsal for the true age of dinosaurs – a kind of ‘Jurassic-lite’. We now know this isn’t how it happened.
Homework.Study.com
homework.study.com › explanation › during-what-era-did-dinosaurs-become-extinct.html
During what era did dinosaurs become extinct? | Homework.Study.com
Dinosaurs went extinct during the Cenozoic Era which is the current geological era. The Cenozoic can be divided into three periods. The first period,... See full answer below. ... Our experts can answer your tough homework and study questions. Ask a question Ask a question · Get access to this video and our entire Q&A library ... What is the Cenozoic era? Learn about the Cenozoic timeline, periods, and epochs.
Quora
quora.com › How-long-ago-did-dinosaurs-go-extinct-and-when-were-their-fossils-discovered-for-the-first-time
How long ago did dinosaurs go extinct, and when were their fossils discovered for the first time? - Quora
Answer (1 of 2): T Rex died out 66 million years ago. No dinosaurs have been found to have lived since. No one knows when the first dinosaur bone was found. Ancient peoples most likely uncovered fossils of dinosaur bones from time to time, but ...
Wikipedia
en.wikipedia.org › wiki › Mesozoic
Mesozoic - Wikipedia
2 weeks ago - Overall, however, the Earth was hotter than it is today. Dinosaurs first appeared in the Mid-Triassic, and became the dominant terrestrial vertebrates in the Late Triassic or Early Jurassic, occupying this position for about 150 or 135 million years until their demise at the end of the Cretaceous.
American Museum of Natural History
amnh.org › dinosaurs › dinosaur-facts
Dinosaur Facts | American Museum of Natural History
Stegosaurus was extinct for 66 million years before Tyrannosaurus walked on Earth. During the Mesozoic Era (a period of more than 180 million years that included the Triassic, Jurassic, and Cretaceous periods), a species of non-avian dinosaur ...
Wikipedia
en.wikipedia.org › wiki › Triassic–Jurassic_extinction
Triassic–Jurassic extinction - Wikipedia
2 weeks ago - Therefore, plagiosaurids and capitosaurs were likely victims of an extinction at the very end of the Triassic, while most other temnospondyls were already extinct. Terrestrial reptile faunas were dominated by archosauromorphs during the Triassic, particularly phytosaurs and members of Pseudosuchia (the reptile lineage which leads to modern crocodilians). In the Early Jurassic and onwards, dinosaurs and pterosaurs became the most common land reptiles, while small reptiles were mostly represented by lepidosauromorphs (such as lizards and tuatara relatives).