Mesozoic Era (Age of the Dinosaurs)

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Presentation transcript:

Mesozoic Era (Age of the Dinosaurs) Three Periods Triassic Jurassic Cretaceous

MESOZOIC ERA KNOWN AS THE MIDDLE ERA TIMEFRAME: Occurred between 248 to 65 million years ago

IMPORTANT EVENT Time marked by rapid movements of plates A major geologic event of the Mesozoic was the break-up of the super continent of Pangaea into several large continents. HAD WARM CLIMATE

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

PANGAEA

LAND (GEOLOGICAL) FEATURES THAT FIRST APPEARE:

Mesozoic Era Cretaceous Period (135-65 MYA) Flower plants CALLED (angiosperms) 1ST APPEARED

ANIMALS/ORGANISMS (BIOLOGICAL) FEATURES THAT FIRST APPEARED:

Mesozoic Era Triassic Period (225-180 MYA) First Dinosaurs (small in size) Pisanosaurus Length:3 feet Height:1 foot Weight:15 pounds Eoraptor: Length:3 feet Height: 1 foot Weight:20 pounds

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

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

Mesozoic Era Jurassic Period (180-135 MYA) 1st birds (Archaeopteryx). Jaws and bone structure like dinosaurs Bones are hollow, like birds Had feathers

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

ANIMALS/ORGANISMS (BIOLOGICAL) & GEOLOGICAL FEATURES THAT BECAME DOMINANT

Mesozoic Era Jurassic Period (180-135 MYA) Dinosaurs BECAME DOMINANT

Mesozoic Era Cretaceous Period (135-65 MYA)

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

Mesozoic Era Triassic Period (225-180 MYA) GYMNOSPERMS BECAME DOMINANT

WHAT CATASTROPHIC EVENT CAUSED THE MASS EXTINCTION?

MASS EXTINCTION Asteroids, METEORITE, or Comets collided into the Earth AND CAUSED Mass Extinction

How could a meteorite impact cause a mass extinction? The impact caused shock waves, tidal waves, and sent a tremendous amount of dust into the atmosphere As the dust re-entered the Earth’s atmosphere, it would have instantly heated the atmosphere causing tremendous forest fires Dust from impact blocked out the sun and caused major climate change and plants to die Plants, animals, etc. went extinct due to the climate changes and competition between organisms

Mesozoic Era Cretaceous Period (135-65 MYA) Mass Extinction: 50% of all plant and animal groups die out Alvarez’s Meteor Impact Theory- 10 km wide meteorite hits Earth

Scientists now have fresh evidence that such a cosmic impact ended the age of dinosaurs near what is now the town of Chixculub in Mexico.

Mesozoic Era Cretaceous Period (135-65 MYA) Evidence of Impact: Iridium An element that is very rare in Earth rocks and very common in meteorites The layer of rocks above the last dinosaur bones contain ~ 160x normal levels of iridium Called the K/T Boundary