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The Age of Dinosaurs[]
The Mesozoic Era, or the Age of Reptiles, lasted from 250 to 65 million years ago. Sharing the earth with the dinosaurs included swimming and flying reptiles, hence the name 'Age of Reptiles'.
The Triassic Period[]
Time: 250 - 200 million years ago
The Late Triassic[]
The Late Triassic was the time at which the dinosaurs first evolved. These first dinosaurs were small, birdlike, carnivorous creatures that ran on two legs. They would have eaten small lizards, and maybe hunted in packs to take down larger prey. They evolved around 230 million years ago. The earliest dinosaurs are commonly discovered in the Valley of the Moon. At the end of the Triassic, Prosauropods also evolved.
Late Triassic Species[]
Eoraptor - An agile carnivore that lived around 230 million years ago. The oldest known dinosaur.
Length: 1 metre
Height: 50cm
Weight: 10kg
Coelophysis - An agile carnivore that may have hunted in packs. Name means 'Hollow Form'. Lived about 228 million years ago.
Length: 3 metres
Height: 1 metre
Weight: 25kg
Herrerasaurus - A small carnivore named after Herrera, its discoverer.
Length: 3 metres
Height: 1 metre
Weight: 40kg
Plateosaurus - The largest known prosauropod. It had a thumb spike on its hand for defence. Herbivorous.
Length: 8 metres
Height: 4 metres
Weight: 2 tonnes
The Jurassic Period[]
Time: 200 - 145 million years ago.
The Early Jurassic[]
In the early Jurassic, dinosaurs began to diversify. Medium sized predators evolved, and so did armoured herbivores and Sauropods. Pangea, the supercontinent of the Triassic Period, split in two, causing new river and ocean currents, which in turn caused plant life to flourish and diversify. The Early Jurassic lasted from roughly 200 million years ago to 180 million years ago.
Early Jurassic Species[]
Dilophosaurus - The first medium-sized predator. Had two strange crests on its head, shaped like half a dinner plate.
Length: 6 metres
Height: 2.5 metres
Weight: 500kg
Scelidosaurus - A small, armoured herbivore, that may be in the Stegosaur or Ankylosaur family.
Length: 4 metres
Height: 1 metre
Weight: 250kg
Barapasaurus - One of the first large sauropods.
Length: 18 metres
Height: 6 metres
Weight: 20 tonnes
The Middle Jurassic[]
Little is known about the middle Jurassic. Dinosaurs continued to diversify, and Sauropods got bigger. New predators evolved, and around this time, life has been found even in Antarctica.
Middle Jurassic Species[]
Cryolophosaurus - A medium-to-large predator from Antarctica, that preyed on late prosauropods.
Length: 8 metres
Height: 3 metres
Weight: 1 tonne
Gasosaurus - a small predatory dinosaur that hunted sauropods in packs.
Length: 4 metres
Height: 1.5 metres
Weight: 150kg
Glacialisaurus - one of the last prosauropods, that lived in Antarctica. Herbivorous. Probably preyed on by Cryolophosaurus.
Length: 7 metres
Height: 3 metres
Weight: 3 tonnes
The Late Jurassic[]
Lots of dinosaurs are known from the Late Jurassic. Sauropods grew to enormous proportions, up to 40 metres in length. Large predators like Allosaurus hunted these, and smaller prey, like the 9 metre long Stegosaurus. Ceratosaurus dominated, then went extinct, due to competition with Allosaurus. The dinosaurs were at one of their peak moments when... at the end of the Jurassic, something unknown happened, that wiped out several dinosaurs, such as Allosaurus and Diplodocus. Pangaea continued to split up.
Late Jurassic Species[]
Allosaurus - The first truly large predator, that would have hunted prey like Sauropods, and stolen from smaller theropods.
Length: 11 metres
Height: 4 metres
Weight: 2 tonnes
Diplodocus - An enormous Sauropod that may have grown up to 30 metres long. Its main defence, other than size, was its long, whip-like tail.
Length: 30 metres
Height: 10 metres
Weight: 10 tonnes
Brachiosaurus - A very heavy Sauropod that was three times as tall as a giraffe.
Length: 25 metres
Height: 16 metres
Weight: 50 tonnes
Ceratosaurus - A medium sized predator that was eventually outcompeted by Allosaurus.
Length: 7 metres
Height: 3 metres
Weight: 500kg
Stegosaurus - An easily recognisable dinosaur, with two rows of plates running down its back, and four spikes on its tail.
Length: 9 metres
Height: 3 metres
Weight: 3 tonnes
Dryosaurus - A small, agile ornithopod that lived in family groups.
Length: 2 metres
Height: 50cm
Weight: 50kg