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GEOLOGIC TIME PowerPoint PPT Presentation


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GEOLOGIC TIME. Time scale app?. PRECAMBRAIN. Longest era Earth was inhospitable Still cooling No atmosphere. Oldest known fossil 3.5 billion years cynobacteria Began producing oxygen Simple cell- no nucleus. STROMATOLITES. PALEOZOIC. Life flourishes in the ocean

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GEOLOGIC TIME

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GEOLOGIC TIME

Time scale app?


PRECAMBRAIN

  • Longest era

  • Earth was inhospitable

    • Still cooling

    • No atmosphere


Oldest known fossil

3.5 billion years

cynobacteria

Began producing oxygen

Simple cell- no nucleus

STROMATOLITES


PALEOZOIC

  • Life flourishes in the ocean

  • Trilobites dominate era


Cambrian

  • Multi-cellular life in seas begin

  • First shells


First fish

Ordovician


Ordovician


First land plants

Fern-like

Sea life continues to flourish

SILURIAN

ammonite


DEVONIAN

  • Fish/ sharks

  • First insects appear


swampy

Huge insects

Eventually created coal deposits

Carboniferous(Mississippian & Pennsylvanian)


Reptiles

First amphibians

Life in sea and land thriving

PERMIAN


MASS EXTINCTION

THE GREAT DYING

80% of species went extinct!


What happened?

  • Climate got hotter

  • Siberian traps

    • volcanoes = CO2


MESOZOIC

  • Dinosaurs now dominate

  • PANGEA is formed


Beginning of dinosaurs

Many small

Primitive mammals

TRIASSIC


Dinosaurs get bigger

First birds

JURASSIC


ARCHAEOPTERYX


CRETACEOUS

  • Intelligent dinosaurs (T-rex, raptors)

  • First flowering plants

  • Carnivorous mammals


MASS EXTINCTION

K/T BOUNDARY

Dinosaurs go extinct


Asteroid theory

  • Asteroid caused climate change

  • 1st- dust blocked out sun

  • 2nd- trapped in heat


Evidence for asteroid theory?

  • Crater

  • Irridium

    • Found in space rocks

  • Shocked quartz


Mammals dominate-

CENOZOIC


Tertiary

  • Mammals

  • First hominoids


ArdiArdipithecus ramidus

  • 4.4 my


Lucy

  • 3.5 my

  • Bipedal hominid


Lucy

LUCY

LUCY


ice ages

Mammoths/mastodons

Neanderthals

QUATERNARY


present

  • When will a new geologic time period start?


resources

  • http://universe-review.ca/R10-19-animals.htm


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