Podcast
Questions and Answers
Some birds are descendants of ______.
Some birds are descendants of ______.
dinosaurs
Alligators and crocodiles are examples of reptiles that survived the K-T ______ event.
Alligators and crocodiles are examples of reptiles that survived the K-T ______ event.
extinction
Some ______ also survived the K-T extinction event.
Some ______ also survived the K-T extinction event.
mammals
PURGATORIUS is known as one of the earliest known ______.
PURGATORIUS is known as one of the earliest known ______.
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PRIMATES are mammals that have hands and feet that ______.
PRIMATES are mammals that have hands and feet that ______.
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At 243 million years old, Nyasasarus Parringtoni is believed to be the oldest known ______.
At 243 million years old, Nyasasarus Parringtoni is believed to be the oldest known ______.
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The size of Nyasasarus Parringtoni was comparable to a larger ______.
The size of Nyasasarus Parringtoni was comparable to a larger ______.
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Humans, apes, monkeys, lemurs, and ______ are examples of primates.
Humans, apes, monkeys, lemurs, and ______ are examples of primates.
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Dinosaurs first appeared during the ______ period approximately 230 million years ago.
Dinosaurs first appeared during the ______ period approximately 230 million years ago.
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Dinosaurs went extinct at the end of the ______ period, approximately 65 million years ago.
Dinosaurs went extinct at the end of the ______ period, approximately 65 million years ago.
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Dinosaurs roamed the Earth for approximately ______ million years.
Dinosaurs roamed the Earth for approximately ______ million years.
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The ______ era includes the Triassic, Jurassic, and Cretaceous periods.
The ______ era includes the Triassic, Jurassic, and Cretaceous periods.
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Tyrannosaurus Rex lived during the ______ period.
Tyrannosaurus Rex lived during the ______ period.
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The supercontinent known as ______ existed when dinosaurs first appeared.
The supercontinent known as ______ existed when dinosaurs first appeared.
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The largest Tyrannosaurus Rex, known as ______, was discovered in Saskatchewan.
The largest Tyrannosaurus Rex, known as ______, was discovered in Saskatchewan.
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The time between the extinction of Stegosaurus and Tyrannosaurus is greater than the time between us and ______.
The time between the extinction of Stegosaurus and Tyrannosaurus is greater than the time between us and ______.
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The K-T extinction event occurred approximately _____ million years ago.
The K-T extinction event occurred approximately _____ million years ago.
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The 'K' in K-T extinction stands for _____, which is German for chalk.
The 'K' in K-T extinction stands for _____, which is German for chalk.
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The large amounts of chalk left behind in Europe are a result of the K-T extinction event and are made up of _____ (CaCO3).
The large amounts of chalk left behind in Europe are a result of the K-T extinction event and are made up of _____ (CaCO3).
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The _____ period follows the Cretaceous period.
The _____ period follows the Cretaceous period.
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Not all dinosaurs died out during the K-T extinction event; _____ are considered to be modern dinosaurs.
Not all dinosaurs died out during the K-T extinction event; _____ are considered to be modern dinosaurs.
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MANIRAPTORAN dinosaurs lived during the _____ period.
MANIRAPTORAN dinosaurs lived during the _____ period.
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The _____ is a thin feathered fold of skin on a bird's wing that aids in flight.
The _____ is a thin feathered fold of skin on a bird's wing that aids in flight.
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Theropod dinosaurs are characterized by having _____ bones and three toes or claws on each limb.
Theropod dinosaurs are characterized by having _____ bones and three toes or claws on each limb.
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Study Notes
Geologic Time Scale: Dinosaurs
- Dinosaurs first appeared during the Triassic Period, approximately 230 million years ago.
- Dinosaurs went extinct at the end of the Cretaceous Period, approximately 65 million years ago.
- This period of time spans 165 million years.
- The Mesozoic Era is known as the Age of Dinosaurs, encompassing the Triassic, Jurassic, and Cretaceous periods.
Dinosaur Evolution
- A diagram shows the evolutionary relationships of dinosaur groups leading to birds.
- The evolutionary pathway from Theropoda to Aves (birds) is shown.
- Key groups like Maniraptora, Paraves, and Aves are highlighted in the evolutionary tree.
- Specific groups like Enantiornithes and Neornithes are referenced.
Dinosaur Extinction
- The K-T extinction event (Cretaceous-Tertiary boundary) ended the age of dinosaurs, 65 million years ago.
- The event is linked to an asteroid impact that led to widespread extinction.
- The event caused a huge impact on the environment.
- Approximately 80% of animal life went extinct during this event.
Dinosaur Diversity
- The Tyrannosaurus Rex, a large theropod, was discovered in Saskatchewan.
- Scotty, the largest Tyrannosaurus Rex, weighed approximately 9.8 tons.
- Scotty's fossils are about 65% complete.
Continental Drift
- When dinosaurs first appeared, continents were all connected in a single landmass called Pangaea.
- Over the 165 million years of dinosaur existence, Pangaea gradually split apart due to tectonic plate movement.
- By the time dinosaurs went extinct, continents resembled their current configuration.
- The Triassic, Jurassic, and Cretaceous periods are used as references for the timing of continental configurations.
Surviving the Extinction Event
- Birds are dinosaurs, and some species survived the extinction.
- Other survivors include alligators, crocodiles, lizards, turtles, frogs, and salamanders.
- Some mammals also survived the K-T extinction event.
- One example is Purgatorius, an early primate.
Other Key Points
- Nyasasaurus Parringtoni, believed to be the oldest known dinosaur, existed at 243 million years old.
- Nyasasaurus Parringtoni was discovered in southern Pangaea during the Triassic Period.
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Description
Explore the fascinating history of dinosaurs from their origin in the Triassic Period to their extinction at the end of the Cretaceous Period. Understand the Mesozoic Era and the evolutionary pathways leading to modern birds. Review key concepts such as dinosaur groups and the K-T extinction event.
