Mesozoic Era (Age of the Dinosaurs)

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Presentation transcript:

Mesozoic Era (Age of the Dinosaurs) 225,000,000 years ago to 65,000,000 years ago Warm Climate Three Periods Triassic Jurassic Cretaceous

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

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

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

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

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

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

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

Mesozoic Era Cretaceous Period (135-65 MYA) Flower plants (angiosperms) evolve & dominate

Mesozoic Era Cretaceous Period (135-65 MYA) Mass Extinction: 50% of all plant and animal groups die out Alvarez’s Meteor Impact Theory- iridium layer (common in meteors), dust blocked out the sun.

Cenozoic Era (Age of the Mammals) 65,000,000 years ago to Present Day Two Periods Tertiary Quaternary

Cenozoic Era Tertiary Period (65 MYA to 1.8 MYA) Warm and humid climate Mammals dominate: increasing in size Earliest prehistoric humans (approx. 4 MYA). Flowering plants (angiosperms) dominate Grasses develop, grazing animals become even larger

The Great Ice Age

Cenozoic Era 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 North American elephants (mastodons, mammoths), giant sloths & armadillos, and saber-toothed cats go extinct. Modern humans evolve, maybe causing the above extinctions from over hunting.