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Triassic Plants | Jurassic Plants | Cretaceous Plants |
Meat-eating animals (carnivores like Tyrannosaurus rex) get their energy by eating other animals, mostly plant-eating animals (herbivores like Triceratops). The herbivores get their energy by eating plants (like cycads). The plants (producers or autotrophs) get their energy from sunlight, converting the light into chemical energy using photosynthesis. |
Leptocycas was a cycad, a primitive seed plant from the late Triassic period. It was a palm-like tree with a long, woody trunk and tough leaves. It lived in warm climates. This tree was about 4.8 ft (1.5 m) tall. |
Williamsonia sewardiana was a cycadeoid (a bennettitalean). It had a woody stem and simple leaves. |
Horsetails were an important source of nutrition for plant-eating dinosaurs. These primitive vascular plants were fast-growing and resilient (they could propagate using underground runners which a grazing dinosaur wouldn't eat). This meant that a hungry dinosaur could eat the plant without killing it, since the plant would regrow from the rhizome (the underground stem). |
Glossopteris, a tree-like seed fern (Pteriosperm) from the Permian through the Triassic Period. It had tongue-shaped leaves and was about 12 ft (3.7 m) tall. Glossopteris was a dominant plant in Gondwana (the southern supercontinent) early in the Triassic period. |
The Mesozoic Era (248 - 65 million years ago) Ages of the Mesozoic Era | ||||||||
Triassic Period 248 - 206 mya First dinosaurs and mammals |
Jurassic Period 206-144 mya Many dinosaurs and the first birds |
Cretaceous Period 144-65 mya First flowering plants, the height of the dinosaurs. Ends in huge extinction. |
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Early - Middle 248-227 mya |
Late 227-206 mya |
Early (Lias) 206-180 mya |
Middle (Dogger) 180-154 mya |
Late (Malm) 154-144 mya |
Early (Neocomian) 144-127 mya |
Middle (Gallic) 127-89 mya |
Late (Senonian) 89-65 mya |
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