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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

GEOLOGIC TIME

Time scale app?

precambrain
PRECAMBRAIN
  • Longest era
  • Earth was inhospitable
    • Still cooling
    • No atmosphere
stromatolites
Oldest known fossil

3.5 billion years

cynobacteria

Began producing oxygen

Simple cell- no nucleus

STROMATOLITES
paleozoic
PALEOZOIC
  • Life flourishes in the ocean
  • Trilobites dominate era
cambrian
Cambrian
  • Multi-cellular life in seas begin
  • First shells
silurian
First land plants

Fern-like

Sea life continues to flourish

SILURIAN

ammonite

devonian
DEVONIAN
  • Fish/ sharks
  • First insects appear
carboniferous mississippian pennsylvanian
swampy

Huge insects

Eventually created coal deposits

Carboniferous(Mississippian & Pennsylvanian)
permian
Reptiles

First amphibians

Life in sea and land thriving

PERMIAN
mass extinction

MASS EXTINCTION

THE GREAT DYING

80% of species went extinct!

what happened
What happened?
  • Climate got hotter
  • Siberian traps
    • volcanoes = CO2
mesozoic
MESOZOIC
  • Dinosaurs now dominate
  • PANGEA is formed
triassic
Beginning of dinosaurs

Many small

Primitive mammals

TRIASSIC
cretaceous
CRETACEOUS
  • Intelligent dinosaurs (T-rex, raptors)
  • First flowering plants
  • Carnivorous mammals
mass extinction1

MASS EXTINCTION

K/T BOUNDARY

Dinosaurs go extinct

asteroid theory
Asteroid theory
  • Asteroid caused climate change
  • 1st- dust blocked out sun
  • 2nd- trapped in heat
evidence for asteroid theory
Evidence for asteroid theory?
  • Crater
  • Irridium
    • Found in space rocks
  • Shocked quartz
tertiary
Tertiary
  • Mammals
  • First hominoids
slide27
Lucy
  • 3.5 my
  • Bipedal hominid
slide28

Lucy

LUCY

LUCY

quaternary
ice ages

Mammoths/mastodons

Neanderthals

QUATERNARY
present
present
  • When will a new geologic time period start?
resources
resources
  • http://universe-review.ca/R10-19-animals.htm
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