Cenozoic Era - Ms. Alderson's Earth and Space Science course -...
Transcript of Cenozoic Era - Ms. Alderson's Earth and Space Science course -...
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CENOZOIC ERA
AGE OF MAMMALS
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Periods & Epochs of the Cenozoic Era
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The Age of Mammals
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KEY CHANGES
• Pangaea separates into continents
• Polar ice covered many continents
• Warm, humid climate changes into a very cold climate covering ¼ of all land with glaciers
• Colorado & Columbia Plateaus formed
• Himalayas, Alps & Andes mountains formed
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Ice Age
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CENOZOIC PERIODS
• Tertiary
– Before the ice age
• Quaternary
– From the ice age to the present
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TERTIARY EPOCHS
• Paleocene
• Eocene
• Oligocene
• Miocene
• Pliocene
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Paleocene
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Eocene
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Oligocene
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Miocene
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QUATERNARY EPOCHS
• Pleistocene
• Holocene
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Pleistocene
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Holocene
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MAMMALS
• Increased in number, size, & variety
• Many have gone extinct
– Creodont, oreodon, mastodon, brontotherium,
baluchitherium, giant armadillo, giant ground sloth
• Some still survive today
– Horse, camel, rhinoceros, pig, dog, whale, bat, rabbit
• Humans are distinguished by their brain size &
bipedal (2 leg) motion
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Creodont
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Oreodon
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Mastodon
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Brontotherium
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Baluchitherium
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Giant Armadillo
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Giant Ground Sloth
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Horse
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The Evolution of the Horse
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OTHER ANIMALS
• In the oceans
– Foraminifers, mollusks, sponges, corals, fish,
sharks, rays
• On the land
– Insects, spiders, centipedes, scorpions,
amphibians, reptiles, birds
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Ray
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Shark
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Life at a Coral Reef
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Centipede
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Scorpion
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Amphibians
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Reptiles
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Birds
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PLANTS
• Temperatures cooled & became drier
• Tropical plants only survived along the equator
• Sequoia & redwood trees survived in California & Oregon
• Many forests were replaced by grasslands with grazing animals
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Tropical Forest
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Sequoia Trees
Coastal Redwood Forest
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Grasslands
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HOMINIDS (HUMANS)
Australopithecus
Homo habilis
Homo erectus
Homo sapien
• 500 cm3 brain, bipedal, human
jaw
• 700 cm3 brain, made & used
simple tools
• 1000 cm3 brain, learned to
control fire
• 1300 cm3 brain, Neanderthals
& Cro-Magnons
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The Evolution of the Human Brain
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700 000 years – 1.7
million years (homo
erectus) thick flat skull
cap, flaring cheek bones,
30 000 years – 230 000
years stone tools, fire,
cave dwellers, hunters,
thick skulls, chinless jaw,
short strong limbs
10 000 years – 40 000
years artists, hunters,
tool makers, prominent
chin, rising forehead,
similar to modern
humans
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Human
Development
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Evolution of Humans
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Australopithecus Homo habilis
Homo erectus
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Neanderthals
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Cro-magnon
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Modern Human
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HOLOCENE EPOCH
• Ice sheets disappeared
• Humans brought about the extinction of other animals & plants
– Hunting & destroying habitat
• Conservation programs were implemented to protect other animals & plants
– Protection programs, sanctuaries, &
regulations