mesozoic era (age of the dinosaurs)
DESCRIPTION
Mesozoic Era (Age of the Dinosaurs). 225,000,000 years ago to 65,000,000 years ago Warm Climate Three Periods Triassic Jurassic Cretaceous. Triassic Period (225-180 MYA). Pangaea (supercontinent) formed. Triassic Period (225-180 MYA). First Dinosaurs (small in size). - PowerPoint PPT PresentationTRANSCRIPT
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Mesozoic EraMesozoic Era(Age of the Dinosaurs)(Age of the Dinosaurs)
225,000,000 years ago225,000,000 years ago toto 65,000,000 years ago65,000,000 years ago
Warm ClimateWarm Climate
Three PeriodsThree Periods
TriassicTriassic
JurassicJurassic
CretaceousCretaceous
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Triassic Period (225-180 MYA)
Pangaea (supercontinent) formed
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Triassic Period (225-180 MYA)
First Dinosaurs (small in size)
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Triassic Period (225-180 MYA)
Conifers and Cycad Forests Dominate (Gymnosperms)
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Jurassic Period (180-135 MYA)
Pangaea starts to separate
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Jurassic Period (180-135 MYA)
Dinosaurs Dominate: Allosaurus, Diplodocus, Brachiosaurus, Stegasaurus.
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Jurassic Period (180-135 MYA)
Reptiles in the sea - Icthyosaurs – 8 m; Plesiosaurs – 15 m.
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Jurassic Period (180-135 MYA)
1st mammals (small rodents).
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Jurassic Period (180-135 MYA)
1st birds (Archaeopteryx).
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Cretaceous Period (135-65 MYA)
Continents in modern positions
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Cretaceous Period (135-65 MYA)
Dinosaurs still dominate: T. rex (carnivore); Triceratops (horned); Trachadon (duck-billed)
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Cretaceous Period (135-65 MYA)
Angiosperms (flowering plants with fruit) evolve & dominate
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Cretaceous Period (135-65 MYA)
Mass Extinction: 50% of all plant and animal groups die
Alvarez’s Meteor Impact Theory- iridium layer (common in meteors), dust blocked out the sun.
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Cenozoic EraCenozoic Era(Age of the Mammals)(Age of the Mammals)
65,000,000 years ag65,000,000 years ago to to Present Dayo Present Day
Two PeriodsTwo Periods
TertiaryTertiary
QuaternaryQuaternary
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Tertiary Period (65 MYA to 1.8 MYA) Warm and humid climate
Mammals dominate: increasing in size
Angiosperms (flowering plants) dominate
Grasses develop, grazing animals become even larger
Earliest prehistoric humans (approximately 3.5 MYA).
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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).
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Animals of the Tertiary
Indricotherium, measured up to 13 ft at the shoulder.
Diatryma, a giant predatory bird.
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The Great Ice
Age
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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 hunting.
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A Sixth Mass Extinction?
• Are we the cause of a sixth mass extinction that is currently taking place?
– Round Table Discussion