Dinosaur Extinction: When and how did dinosaurs become extinct

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Dinosaur Jungle   >   Dinosaur Facts   >   Extinction

Dinosaur Extinction

Dinosaurs inhabited the earth for over 165 million years, during the Mesozoic Era.

Most dinosaur species lived and died out during this period, but at the end of the Cretaceous period (65 million years ago), all remaining types of dinosaurs (with the exception of birds which had already evolved, and are widely believed to be descended from dinosaurs) died out. At the same time many other creatures (for example Ammonites, and Belemnites, as well as Pterosaurs, and many large marine reptiles such as Mosasaurs. Plesiosaurs and Pliosaurs) also became extinct. In fact, all animals weighing more than 55 pounds (25 kilograms) seem to have died out!

While are not sure what happened, we do know that something happened at about 65 million years ago. This event shows up as clear boundary in the rocks, known as the "K-T boundary", the extinction event usually being referrred to as the "Cretaceous-Tertiary mass extinction".

K-T boundary in rocks near Drumheller, Alberta, Canada

Scientists have proposed many different possible explanations for what may have happened, and why this mass extinction might have happened:

(Note: Sometimes these suggested explanations are informally called "theories", however in this case "hypotheses" is the correct term, since in science a theory means a well-substantiated explanation of some natural phenomenon or observation, whereas as "hypothesis" means a suggested explanation which needs to be tested against experimental evidence).
    Artist's impression of KT impact event
  • Asteriod Impact Hypothesis

    • Hypothesis: An asteriod hit the earth.

    • Effect: Apart from the immediate impact of fires and flooding (if it hit the sea), this would have caused catastrophic changes in the environment because of the dust thrown up in to the air blocking out sunlight.

    • Our Evaluation: This is currently the most popular hypothesis with scientists, because, as Luis and Walter Alvarez pointed out, iridium (which comes from asteroids) has been found all over the world in rocks at the K-T boundary (which were laid down at the time of the mass extinction). There is also a large crater at Chixulub in southern Mexico, which appears to be of the right age, and could have been made as a result of an asteroid hitting the earth.

    Artist's impression of Deccan traps volcanism
  • Volcanism Hypothesis

    • Hypothesis: Volcanoes (there is known to have been very active volcanic around this time, especially in India in a region that is today known as the Deccan Traps) could have caused catastrophic changes in the environment.

    • Effect: The dust from volcanoes would have affected the climate, sulphur from volcanoes could have caused immensely strong acid rain, and poisonous substances such as selenium could have been released into the atmosphere.

    • Our Evaluation: After the Asteroid Impact Hypothesis, this is probably the second most popular explanation among scientists - partly, because we know that volcanoes were active at about this time.

    Artist's impression of a supernova
  • Supernova Hypothesis

    • Hypothesis: A nearby star exploded as a supernova.

    • Effect: A nearby supernova would have bathed the earth in deadly radiation.

    • Our Evaluation: If this hypothesis is true, rocks at the K-T boundary should contain 244Pu (a long-lived isotope of Plutonium). However, this does not seem to be the case.

  • Climatic Change Hypothesis

    • Hypothesis: Changes in the Earth's climate caused the mass extinction. This could have been caused by gradual changes in the positions of continents effecting ocean currents and winds, or by changes in the Earth's orbit around the sun, or even by a relatively sudden greenhouse effects.

    • Effect: Depends on the particular climate change theory in question.

    • Our Evaluation: This hypothesis can not be discounted, and even if climate change was not the main cause of the extinction, it could have played a part - there is some evidence that the Earth cooled at the end of the Cretaceous period.

  • Flowers Drugged the Dinosaurs Hypothesis

    • Hypothesis: The first flowering plants appeared during the Cretaceous period, and if dinosaurs ate them they could have been drugged by them.

    • Effect: Could perhaps have wiped out some dinosaurs.

    • Our Evaluation: This hypothesis does not explain the extinction of many other species, especially marine species. It also struggles with the fact that dinosaurs and flowering plants were contempories for many millions of years, and only suddenly, at 65 million years ago, the dinosaurs died out.

  • Mammals Ate the Dinosaurs' Eggs Hypothesis

    • Hypothesis: Mammals ate the dinosaurs' eggs.

    • Effect: Could perhaps have wiped out some dinosaurs.

    • Our Evaluation: This used to be a popular hypothesis - but does not explain the extinction of many other species, especially marine species. It also does not explain why dinosaurs were very successful for millions and millions of years, during most of which time, mammals were also around.

  • Caterpillars Ate All the Plants Hypothesis

    • Hypothesis: Caterpillars ate all the plants and there was not enough food for herbivores, and eventually not enough meat for carnivores.

    • Effect: Could perhaps have wiped out some dinosaurs.

    • Our Evaluation: This hypothesis does not explain the extinction of marine species, and some may wonder whether caterpillars could really affect every continent on the Earth at the same time to this extent.

  • Disease Epidemic Hypothesis

    • Hypothesis: The dinosaurs could have been wiped out by a disease epidemic.

    • Effect: Could perhaps have wiped out some dinosaurs.

    • Our Evaluation: The problem with this hypothesis, is could it effect dinosaurs to the extent of wiping them all out, and how could it explain the simultaneous extinction of marine animals?

Although many scientists now favor the asteroid impact hypothesis, it is not yet actually certain that this is the reason why the dinosaurs died out. It is possible that one of the other theories might be the correct one. It is also possible, that there could have been several events which happened together, and between them, killed all the dinosaurs.

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Books about Dinosaur Extinction

Here are some books from Amazon.com:

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The Rise and Fall of the Dinosaurs: A New History of a Lost World
By Steve Brusatte

William Morrow
Released: 2018-04-24
Hardcover (416 pages)

The Rise and Fall of the Dinosaurs: A New History of a Lost World
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"THE ULTIMATE DINOSAUR BIOGRAPHY," hails Scientific American: A thrilling new history of the age of dinosaurs, from one of our finest young scientists.

"A masterpiece of science writing." —Washington Post

A New York Times Bestseller • Goodreads Choice Awards Winner • A BEST BOOK OF THE YEAR: Smithsonian, Science Friday, The Times (London), Popular Mechanics, Science News

"This is scientific storytelling at its most visceral, striding with the beasts through their Triassic dawn, Jurassic dominance, and abrupt demise in the Cretaceous." —Nature

The dinosaurs. Sixty-six million years ago, the Earth’s most fearsome creatures vanished. Today they remain one of our planet’s great mysteries. Now The Rise and Fall of the Dinosaurs reveals their extraordinary, 200-million-year-long story as never before.

In this captivating narrative (enlivened with more than seventy original illustrations and photographs), Steve Brusatte, a young American paleontologist who has emerged as one of the foremost stars of the field—naming fifteen new species and leading groundbreaking scientific studies and fieldwork—masterfully tells the complete, surprising, and new history of the dinosaurs, drawing on cutting-edge science to dramatically bring to life their lost world and illuminate their enigmatic origins, spectacular flourishing, astonishing diversity, cataclysmic extinction, and startling living legacy. Captivating and revelatory, The Rise and Fall of the Dinosaurs is a book for the ages.

Brusatte traces the evolution of dinosaurs from their inauspicious start as small shadow dwellers—themselves the beneficiaries of a mass extinction caused by volcanic eruptions at the beginning of the Triassic period—into the dominant array of species every wide-eyed child memorizes today, T. rex, Triceratops, Brontosaurus, and more. This gifted scientist and writer re-creates the dinosaurs’ peak during the Jurassic and Cretaceous, when thousands of species thrived, and winged and feathered dinosaurs, the prehistoric ancestors of modern birds, emerged. The story continues to the end of the Cretaceous period, when a giant asteroid or comet struck the planet and nearly every dinosaur species (but not all) died out, in the most extraordinary extinction event in earth’s history, one full of lessons for today as we confront a “sixth extinction.”

Brusatte also recalls compelling stories from his globe-trotting expeditions during one of the most exciting eras in dinosaur research—which he calls “a new golden age of discovery”—and offers thrilling accounts of some of the remarkable findings he and his colleagues have made, including primitive human-sized tyrannosaurs; monstrous carnivores even larger than T. rex; and paradigm-shifting feathered raptors from China.

An electrifying scientific history that unearths the dinosaurs’ epic saga, The Rise and Fall of the Dinosaurs will be a definitive and treasured account for decades to come.

Includes 75 images, world maps of the prehistoric earth, and a dinosaur family tree.

What Happened to the Dinosaurs? (Let's-Read-and-Find-Out Science 2)

Released: 2000-06-21
Paperback (32 pages)

What Happened to the Dinosaurs? (Let s-Read-and-Find-Out Science 2)
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  • Harpercollins Childrens Books
Product Description:

What happened to the dinosaurs?

For millions of years these fantastic creatures roamed our planet. Then, suddenly, they all disappeared. Scientists wonder why. What could have caused this huge extinction 65 million years ago?

In this enlarged edition, distinguished writer Franklyn M. Branley and award-winning artist Marc Simont provide the perfect introduction to an always fascinating subject - the disappearance of the dinosaurs.

Outstanding Science Trade Books for Children 1989 (NSTA/CBC)

The Sixth Extinction: An Unnatural History
By Elizabeth Kolbert

Kolbert Elizabeth
Released: 2015-01-06
Paperback (336 pages)

The Sixth Extinction: An Unnatural History
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  • The Sixth Extinction An Unnatural History
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A major book about the future of the world, blending intellectual and natural history and field reporting into a powerful account of the mass extinction unfolding before our eyes

Over the last half-billion years, there have been Five mass extinctions, when the diversity of life on earth suddenly and dramatically contracted. Scientists around the world are currently monitoring the sixth extinction, predicted to be the most devastating extinction event since the asteroid impact that wiped out the dinosaurs. This time around, the cataclysm is us. In prose that is at once frank, entertaining, and deeply informed, New Yorker writer Elizabeth Kolbert tells us why and how human beings have altered life on the planet in a way no species has before. Interweaving research in half a dozen disciplines, descriptions of the fascinating species that have already been lost, and the history of extinction as a concept, Kolbert provides a moving and comprehensive account of the disappearances occurring before our very eyes. She shows that the sixth extinction is likely to be mankind's most lasting legacy, compelling us to rethink the fundamental question of what it means to be human.

Age of Dinosaur Extinction: Childrens Book
By Mark J. Baring

Hardcover (156 pages)

Age of Dinosaur Extinction: Childrens Book
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Recommended Readers Age 10 and Above.... One Day, One Million Year Ago.. One day, you are walking through a prehistoric forest, you hear a twig snap behind you. You turn, slowly, hoping that it isn't what you think it is. Standing behind you is a Stegosaurus, chomping away on some leafy ferns. You breathe a sigh of relief. You were afraid it was a predator with its eye on you as a tasty snack. Of course, that was millions of years ago, so it could only happen in your imagination. In fact it was so long ago that there were no people around at all; there weren't even any apes or monkeys yet! The prehistoric world of the dinosaurs is both strange and exciting. Many things were very different from what you see today. Some dinosaurs stood taller than buildings, and others weighed as much as your entire family put together. Some dinosaurs were small enough to fit in your backpack. Some would not hesitate to eat you on the spot if they were hungry. Others spent all day chomping on ferns and other plants. The one kind of dinosaur that never existed was a dull dinosaur! There is so much to know about dinosaurs. What is a dinosaur? How is it different from animals today? Are there any dinosaurs living now? Where did dinosaurs live? What did they eat? What did they look like? Why are they gone? How do we know about dinosaurs? Were other animals living at the time of the dinosaurs? How did dinosaurs get their food? Did dinosaurs sleep? How did dinosaurs move? How did dinosaurs protect themselves? Did dinosaurs fight? Could dinosaurs swim? How big was a baby dinosaur? Were dinosaurs poisonous? No matter how long this book is, it could never cover everything there is to know about every dinosaur. If you wish to learn more about dinosaurs, you can find lots of information at the library. You can check out the reference section in the back of the book. You can also visit natural history museums.
The Day the Dinosaurs Died (I Can Read Level 2)
By Charlotte Lewis Brown

Released: 2007-06-12
Paperback (48 pages)

The Day the Dinosaurs Died (I Can Read Level 2)
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  • HarperCollins
Product Description:

A compelling account of how the impact of a giant asteroid may have killed the Earth’s dinosaurs.

Edge of Extinction #1: The Ark Plan
By Laura Martin

Released: 2017-05-02
Paperback (384 pages)

Edge of Extinction #1: The Ark Plan
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Jurassic World meets Dawn of the Planet of the Apes in this epic new middle grade series full of heart-pounding action and breathtaking chills! "Amazing adventures!" raves Brightly.com as they recommend Edge of Extinction as a Holiday Gift for Tween Readers. 

One hundred and fifty years ago, the first dinosaurs were cloned. Soon after, they replaced humans at the top of the food chain. The only way to survive was to move into underground compounds. . . .

Five years ago, Sky Mundy’s father vanished from North Compound without a trace. Now she has just stumbled on a clue that not only suggests his disappearance is just the tip of an even larger mystery, but also points directly to the surface. To find her dad—and possibly even save the world—Sky and her best friend, Shawn, must break out of their underground home and venture topside to a land reclaimed by nature and ruled by dinosaurs.

Perfect for fans of Brandon Mull, Lisa McMann, and Rick Riordan, this exhilarating debut novel follows two courageous friends who must survive in a lost world that’s as dangerous as they’ve always feared but also unlike anything they could ever have imagined.

Pathfinder Adventure Path: Siege of the Dinosaurs (Extinction Curse 4 of 6) (P2)
By Kate Baker

Paizo Inc.
Game (96 pages)

Pathfinder Adventure Path: Siege of the Dinosaurs (Extinction Curse 4 of 6) (P2)
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The heroes and their circus arrive in Willowside, a swamp community in dire need of diversion from the relentless expansion of the blighted land known as the Welt. Willowside soon experiences a problem of a different sort, as dinosaur-riding xulgaths blockade the town. The heroes mount a defense of the village and learn what has brought the xulgaths to this isolated settlement. When the heroes break the siege, they learn that the xulgaths follow a monstrous ex-slave and have forsaken their directive to assault a nearby aeon tower. The tower's current occupants know more, and put the heroes on the path to reach the fifth and final aeon orb.

“Siege of the Dinosaurs” is a Pathfinder adventure for four 13th-level characters. This adventure continues the Extinction Curse Adventure Path, a six-part, monthly campaign in which the heroes lead a traveling circus as they unravel a plot to eradicate all life from the islands of the Inner Sea. This volume also includes a gazetteer of the town of Willowside and lore about the inhabitants of the Abyssal realm of Gluttondark, as well as new monsters and xulgath-themed rules.

Each monthly full-color softcover Pathfinder Adventure Path volume contains an in-depth adventure scenario, stats for several new monsters, and support articles meant to give Game Masters additional material to expand their campaign. Pathfinder Adventure Path volumes use the Open Game License and work with both the Pathfinder RPG and the world’s oldest fantasy RPG.
Dinosaurs Rediscovered: The Scientific Revolution in Paleontology
By Michael J. Benton

Thames & Hudson
Released: 2019-05-07
Hardcover (352 pages)

Dinosaurs Rediscovered: The Scientific Revolution in Paleontology
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In this fascinating and accessible overview, renowned paleontologist Michael J. Benton reveals how our understanding of dinosaurs is being transformed by recent fossil finds and new technology.

Over the past twenty years, the study of dinosaurs has transformed into a true scientific discipline. New technologies have revealed secrets locked in prehistoric bones that no one could have previously predicted. We can now work out the color of dinosaurs, the force of their bite, their top speeds, and even how they cared for their young.

Remarkable new fossil discoveries―giant sauropod dinosaur skeletons in Patagonia, dinosaurs with feathers in China, and a tiny dinosaur tail in Burmese amber―remain the lifeblood of modern paleobiology. Thanks to advances in technologies and methods, however, there has been a recent revolution in the scope of new information gleaned from such fossil finds.

In Dinosaurs Rediscovered, leading paleontologist Michael J. Benton gathers together all the latest paleontological evidence, tracing the transformation of dinosaur study from its roots in antiquated natural history to an indisputably scientific field. Among other things, the book explores how dinosaur remains are found and excavated, and especially how paleontologists read the details of dinosaurs’ lives from their fossils―their colors, their growth, and even whether we will ever be able to bring them back to life. Benton’s account shows that, though extinct, dinosaurs are still very much a part of our world.

120 illustrations
Alpha: The End of the Dinosaurs
By Jack Schneider

New Degree Press
Paperback (138 pages)

Alpha: The End of the Dinosaurs
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The Mesozoic era, aka “The Age of Dinosaurs,” spans the period of time on Earth from 250-65 million years ago. We know that the dinosaurs have gone extinct, but has anyone ever thought about what their last days were like?In this book, you will follow the story of an Acheroraptor named Alpha and learn about the Earth as it was 65 million years ago. You will experience:* A pack of raptors on the hunt and their confrontation with a larger predator* The impact of the asteroid and the 24 hours of hell on Earth that followed* The months after the impact and the factors that drove dinosaurs to extinctionThe information provided in Alpha has been gathered from credentialed paleontologists such as Dr. Jim Kirkland, Dr, Philip Currie, Dr. Thomas Holtz, Jr., Dr. Thomas Carr, and Dr. Penny Higgins, as well as from multiple books and documentaries. This is currently our best theory as to what happened 65 million years ago.Alpha puts a new spin on one of Earth’s oldest stories. It’s a must-have for the dinosaur fan’s library, and a great starter for those new to the field.
Edge of Extinction #2: Code Name Flood
By Laura Martin

Released: 2018-05-01
Paperback (368 pages)

Edge of Extinction #2: Code Name Flood
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Perfect for fans of Jurassic Park and Jurassic World! Code Name Flood is the electrifying sequel to The Ark Plan, which School Library Journal praised by saying: “Nonstop action, marauding dinosaurs, and kids on the run: What’s not to like?”

Last week, twelve-year-old Sky found a cryptic message from her dad, who mysteriously fled the safety of their underground compound five years ago. The note said the fate of the world depended on her going topside, to a lost world that’s ruled by dinosaurs.

Today, after a treacherous journey through the wilderness, Sky and her friends have made it to their destination: Lake Michigan. There they discover a hidden underwater lab, and with the help of its scientists, Sky will finally learn the truth about her father’s secret mission.

Tomorrow, it will be up to Sky and her friends to save humanity from the very edge of extinction.

Readers who enjoy middle grade adventures by Brandon Mull and Rick Riordan will love this action-packed story, which takes the premise of Michael Crichton’s bestselling classic to a whole new level, envisioning a postapocalyptic future where cloned dinosaurs have taken over and the world’s only hope is one group of courageous kids.

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