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Dinosaurs · K-12

Dinosaur Eras and Geologic Time

The Triassic, Jurassic, and Cretaceous periods with their approximate dates and characteristic dinosaurs, one concept per card.

35 cards · basic cards · AI-written, checked twice. Edit anything.

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Which period came first: Triassic, Jurassic, or Cretaceous?
Triassic
What time range does the Triassic Period cover?
252 to 201 million years ago
What time range does the Jurassic Period cover?
201 to 145 million years ago
What time range does the Cretaceous Period cover?
145 to 66 million years ago
Which period is called the 'Age of Reptiles' or 'Age of Dinosaurs'?
The Mesozoic Era, which includes all three periods
What major event ended the Cretaceous Period?
An asteroid impact combined with volcanic activity
Name a small early dinosaur from the Triassic Period.
Eoraptor or Herrerasaurus
What was Plateosaurus?
An early long-necked herbivorous dinosaur from the Triassic
What was Stegosaurus?
A herbivorous dinosaur with large plates running down its back
Name a famous long-necked dinosaur from the Jurassic Period.
Brachiosaurus or Apatosaurus
Approximately how long was Brachiosaurus?
About 85 feet long
What was Allosaurus?
A large carnivorous theropod dinosaur from the Jurassic Period
Which dinosaur is considered the largest land animal ever?
Argentinosaurus or Patagotitan
What period did Tyrannosaurus rex live in?
The Cretaceous Period
Approximately how long was Tyrannosaurus rex?
About 40 feet long

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