THE GEO TIMESCALE

PRECAMBRIAN ERA

• 90% of Earths history
• Unknown beginning-542mya

ARCHAEAN PERIOD

• Greek for "Ancient"
• Lasted 2500mys
• Development: Oceans, Atmosphere, Continents
• Life: Bacteria

STROMATOLITE (BACTERIA)

PROTERZOIC PERIOD

• Greek for "Earlier Animal"
• Lasted 2000mys
• Development: Free Oxygen
• Life: Multicelled Organisms

GREEN ALGAE&RED ALGAE

SPONGES

PALEOZOIC ERA

• Greek for "Old Animal"
• 542mya-241mya

CAMBRIAN PERIOD

• Known as Cambrian Explosion-->rapid evolution of a variety of species
• Lasted 54mys
• Life: invertebrate sea life

SEA URCHINS

STAR FISH

ORDOVICIAN PERIOD

• Steady Climate
• Lasted 45mys
• Life: Diverse Marine Life, Vascular Plants

pteraspidomorphi

TRILOBITES

SILURIAN PERIOD

• Organisms first started to colonize land
• Lasted 28mys
• Life: Coral Reefs, 1st jawed fish, Giant Scorpians

MYRIAPOD

ARACHNIDS

DEVONIAN PERIOD

• Rise of the first sarcoeterygians (lobe-finned fish)
• Lasted 57mys
• Life: 1st Trees, Fish, Wingless Insects

Zosterophylls

Trimerophytes

CARBONIFEROUS PERIOD

• Latin for "Carbon to Bear"
• Maximum coal formation in swampy forests
• Lasted 60mys
• Life: Insects, Amphibians, Reptiles, Fish, Clams, Crustaceans

PTERIDOPSIDA (FERNS)

LYCOPHYTA (SCALE TREES)

PERMIAN PERIOD

• Most species became extinct in this period
• Lasted 48mys
• Life: Large Reptiles, Amphibians

THERAPSIDS

HELICOPRION

MESOZOIC ERA

• "Age of Reptiles"
• Greek for "Middle Animal"
• 251mya-66mya

TRIASSIC PERIOD

• Follows biggest extinction event in the history of life
• 51mys
• Life: Early Dinosaurs, Crocodile, Turtles, 1st Mammals

EARLY TRIASSIC DINOSAURS

LATER TRIASSIC DINOSAURS

JURASSIC PERIOD

• Earliest known birds
• Lasted 54mys
• Life: EARLY: large dinosaurs, LATER: flying reptiles

T REX

TRICERATOPS

CRETACEOUS PERIOD

• Latin for "Chalk"--I know it doesnt make sense
• Dinosaurs dominate
• Lasted 80mys
• Life: Dinosaurs, Small Mammals, Seed Bearing Plants

Anthophyta

Bacillariophyta (The Diatoms)

CENOZOIC ERA

• Greek for "New Animal"
• "Age of Mammals"
• 66mya-PRESENT

TERTIARY PERIOD

• Greek for "Old Born"
• Increasily diverse life
• Lasted 42mys
• Life: Insect Fauna, Early bats, Mammals, Birds

Hyaenodon gigas

PLESIADAPIS

QUATERNARY PERIOD

• Greek for "New Born"
• 23mys...
• Life: Various forms of humans, growing diversity of mammals

ANCESTORS OF MODERN ANIMALS

WELL...YOU KNOW

BIBLIOGRAPHY IN MLA fORMAT

• "Geological Timescale (Table)." Info Please. 16 Apr. 2014. .
• "Triassic Life, Jurassic Life, Carboniferous Life,." Berkeley Website. 16 Apr. 2014. .
• BE KIND AND REWIND :)