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The Mesozoic Era

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Plants: The first flowering plants began in the Cretaceous ... The Cretaceous Period ended with a mass extinction about 65 million years ago, ... – PowerPoint PPT presentation

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Title: The Mesozoic Era


1
The Mesozoic Era
  • By Alex Reyer

2
248-65 Million Years Ago
  • Mesozoic means middle animals and is referred
    to as the Age of the Dinosaurs
  • There are 3 major subdivisions of the Mesozoic
    Era Triassic (245-208 Million Years Ago), the
    Jurassic (208-146 Million Years Ago), and the
    Cretaceous (146-65 Million Years Ago)

http//www.ucmp.berkeley.edu/mesozoic/mesozoic.htm
l
3
Triassic Period
  • One supercontinent PANGAEA
  • Animals The first small, fast dinosaurs, the
    first mammals and marine reptiles like the
    trilobite appeared in this period. Frogs,
    turtles, lizards and snakes also first appeared
    here.
  • Plants Ferns and conifers dominated the land,
    with some evergreens and palm-tree like plants
  • Climate Hot and Dry

http//www.dinotreker.com/Late_Triassic_Globe.jpg
4
End of the Triassic
  • The end of the Triassic period was marked by a
    mass extinction where 35 of all animals died
    out. This was brought on by massive volcanic
    eruptions between 208- 213 million years ago.
  • At this time, Pangaea began to break apart
  • The extinction allowed for dinosaurs to flourish
    and rule for the next 150 million years

http//www.sciencedaily.com/images/2007/07/0707191
43512.jpg
5
Jurassic Period
  • Animals More diverse mammals, sea life was
    abundant (coral, fish, sharks, squid and rays),
    and dinosaurs dominated. First birds appeared
  • As Pangaea began to break apart it separated into
    Laurasia and Gondwana by the end of the Jurassic
  • Plants Remained the same from the Triassic
  • Climate Hot and dry, with strong seasonality at
    first, changing to warm and moist with no polar
    ice and vast flooded areas.

http//anthro.palomar.edu/earlyprimates/images/map
_of_earth_at_125_million.gif
6
Cretaceous Period
  • The supercontinent was well on its way to
    breaking up and formed the continents we know
    today about 130 million years ago
  • Animals DINOSAURS!!! The first placental mammals
    appeared as did more species of birds
  • Plants The first flowering plants began in the
    Cretaceous
  • Climate No polar ice-caps, more seasonality,
    sea-levels rose, greater extremes between
    equatorial and polar temperatures.

http//www.enchantedlearning.com/subjects/dinosaur
s/mesozoic/cretaceous/
7
Large Dinosaurs in the Jurassic
http//www.windows.ucar.edu/tour/link/earth/geolo
gy/images/mesozoic_jpg_image.html
8
Dinosaur Facts
  • Dinosaurs are most recognizable by their size,
    teeth, claws and scary features!
  • They evolved from reptilian ancestors 230 million
    years ago, after the Permian-Triassic extinction
    where more than 95 of all life on earth went
    extinct
  • They varied greatly in size from 2 feet long and
    6 lbs, to 100 feet long (and/or tall) weighing
    100 tons

9
(No Transcript)
10
http//en.wikipedia.org/wiki/Dinosaur
11
End of the Cretaceous What Killed the Dinosaurs?
http//www.pbs.org/wgbh/evolution/extinction/dinos
aurs/ed_pop.html
  • The Cretaceous Period ended with a mass
    extinction about 65 million years ago, wiping out
    the dinosaurs and most animals (except birds).
    Theories about the cause of the extinction
    include asteroid impact, high- volcanic activity,
    climate changes, or disease.
  • The Age of the Dinosaurs was over and the Age of
    the Mammals began

http//www.cartoonstock.com/lowres/wpr0075l.jpg
12
Educational (and fun!) websites!
  • http//www.kidsdinos.com/dinosaur-games/index.php
  • www.kidsdinos.com
  • http//www.ucmp.berkeley.edu/diapsids/extinction.h
    tml
  • http//www.enchantedlearning.com/subjects/dinosaur
    s/
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