Dinosaurs

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Paleontology[edit]

Paleontology is a study of prehistoric life. Remains of ancient plants and animals are called fossils. Fossils are studied and excavated by scientists, paleontologists.

Eras and periods[edit]

First ''era'' of prehistoric multicellular life is called Proterozoic. 650 million years ago(mya) a mass extinction happened(mass extinction-is a period when many spieces of animals or plants die). After extinction, new spieces named vendobionts appeared. Next 550 mya, after the death of vendobionts, new era begun-Paleozoic. After another mass extinction Mezozoic era started. Now dinosaurs rule. After they became extinct, Cenozoic era begun. People appear.

Paleozoic

Cambrian period

Main predator:Anomalocaris;

Ordovician

Main predator:Orthocone

Orthocone

Silurian

Main predator:Sea scorpion

Devonian

Main predator:Armoured fish

Hyaenodon

Carboniferous

Main predator:Giant dragonfly

Permian

Main predator:Dimetrodon

Dimetrodon

Mezozoic

Main predators:Dinosaurs(see below)

Cenozoic

Tertiary

Main predator:Hyaenodon

Quaternary

Main predators:Saber-tooth tiger,human.

Horned dinosaur
Armoured dinosaur
Iguanodon
Long-necked dinosaur
Dinosaur footprints

Dinosaurs[edit]

Dinosaurs are extinct reptiles. They lived from 230 million years ago to 63 million years ago(throughout Triassic, Jurassic and Cretaceous periods).

Discovery[edit]

1818 - In USA was found first dinosaur trackway.In UK bones of Iguanodon are found.

1822 - Megalosaurus is named.

1824 - Iguanodon is named.

Appearing[edit]

Dinosaurs appeared 230 million years ago.Their ancestors were crocodile-like, and walked on 4 legs (they were quadrupedal).Some dinosaurs,howewer, were two-legged (bipedal).

Interesting discoveries[edit]

1968 John Ostrom finds 4 Deinonychus near the Tenontosaurus(Deinonychus is a predator).

Deinonychus

1915;1927 The largest land dinosaurs-carnivores are discovered :Spinosaurus(18 metres;20-25 tonns);Carcharodontosaurus(16 metres;8-9 tonns).

Educational films[edit]

  • "Jurassic Fight Club"
  • "Walking with dinosaurs"
  • "Animal armaggedon'

See also[edit]

External links[edit]