Mesozoic Era (Age of the Reptiles)

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Presentation transcript:

Mesozoic Era (Age of the Reptiles) 248 million years ago to 65 million years ago Pangaea separates Three Periods Triassic Jurassic Cretaceous

Triassic Period (225-180 MYA) Pangaea (supercontinent) formed

Triassic Period (225-180 MYA) First Dinosaurs (small in size)

Triassic Period (225-180 MYA) Conifers and Cycad Forests Dominate (Gymnosperms)

Jurassic Period (180-135 MYA) Pangaea starts to separate

Jurassic Period (180-135 MYA) Dinosaurs Dominate: Allosaurus, Diplodocus, Brachiosaurus, Stegasaurus.

Jurassic Period (180-135 MYA) Reptiles in the sea - Icthyosaurs – 8 m; Plesiosaurs – 15 m.

Jurassic Period (180-135 MYA) 1st mammals (small rodents).

Jurassic Period (180-135 MYA) 1st birds. Evidence that birds evolved from Dinosaurs tomorrow...

Cretaceous Period (135-65 MYA) Continents in modern positions

Cretaceous Period (135-65 MYA) Dinosaurs still dominate: T. rex (carnivore); Triceratops (horned); Trachadon (duck-billed)

Cretaceous Period (135-65 MYA) Angiosperms (flowering plants with fruit) evolve & dominate

Cretaceous Period (135-65 MYA) Mass Extinction: 50% of all plant and animal groups die Alvarez’s Meteor Impact Theory- KT Boundary: iridium layer (common in meteors) in rock record Dust from impact blocked out the sun and caused major climate change and plants to die. VIDEO

Cenozoic Era (Age of the Mammals) 65 million years ago to Present Day Two Periods Tertiary Quaternary

Tertiary Period (65 MYA to 1.8 MYA) Starts with a warm and humid climate Mammals dominate: increasing in size Angiosperms (flowering plants) dominate Grasses develop, grazing animals become even larger Earliest prehistoric humans (approximately 6 to 7 MYA).

Animals of the Tertiary Organisms that have been found in the La Brea tar pits of Los Angeles Megatherium, a giant ground sloth (20 ft long).

Animals of the Tertiary Indricotherium, measured up to 13 ft at the shoulder. Diatryma, a giant predatory bird.

The Great Ice Age

Quaternary Period (1.8 MYA to Present) The “Great Ice Age”, ice sheets covered 30% of all land Land & ice bridges connected many continents allowing animal migration Large North American animals go extinct: elephants (mastodons, mammoths), giant sloths & armadillos, and saber-toothed cats Modern humans evolve, maybe causing the above extinctions from hunting.

A Sixth Mass Extinction? Are we the cause of a sixth mass extinction that is currently taking place? Round Table Discussion