Our Timeline

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Our Timeline
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Precambrian Time

• The Precambrian Time lasted for 3,956 million
  years. Some of the life forms were stromatolites,
  archea, eukaryotes, and multi-celled animals.

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Precambrian Time

• Atmosphere
• During the middle of this era here was oxygen,
  but not much.
• Also the atmosphere was made up of methane,
  ammonia, hydrogen, carbon monoxide, and other
  gasses that could kill us.

• Continents

During the Precambrian Era the continents were
still stuck together.
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Life Forms

• There were many life forms in the Precambrian era
  but here is a few life forms that were living
  then and they were stromatolites, archea,
  eukaryotes, and the first multi-celled algea and
  multi-celled animals.

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Paleozoic Era
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Plants

• The plants were fern like and weren't flowering.
  Some plants were liver warts, ferns, and cycads.

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Animals

• Most of animals were fish and amphibians and most
  the fossils that were found were form underwater
  creatures

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Atmosphere

• Much of the Northern Hemisphere was under warm
  Shallow seas. The atmosphere was mostly nitrogen
  and oxygen

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Triassic Period
245 million years ago-208 years ago

• Life-Forms
• Centipedes
• Spiders
• Giant Millipedes
• Scorpions
• Cockroach
• Turtles
• Bony Fish
• Starfish
• sharks

• Plants
• Cycads
• Ginkgoes
• Club mosses
• Seed ferns

• Weather/Continental
• Pangaea drifts north
• Climate becomes dryer
• Cold winters
• Hot Summers

• Placodonts
• Nothosaurs
• Ichthyosaurs
• Therapsids

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Jurassic Period
208 years ago to 146 million years ago

• Life-Forms
• Crocodiles
• Sharks
• Rays
• Squid
• Octopus
• Beetles
• Snails
• Wasps
• Ants

• Plants
• Conifers
• redwood
• pine

• cypress
• Yews
• Seed plants

• Weather/ Continental
• Pangaea twists apart
• Warm and Moist
• Rain begins to fall

• Lizards
• Many Dinosaur

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Cretaceous Period
146 million years ago 65 million years ago

• Animals
• Stegosaurs
• Amphibians
• Duck-billed
• Butterflies
• Modern birds
• Grass hoppers
• Termites
• Dinosaurs die off land at end of period.

• Plants
• flowering plants
• Magnolia
• palms

• Weather/ Continental
• Pangaea keeps moving
• Rocky and Andes Mts.
• Huge asteroid hits earth
• climate cools down

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Cenozoic era
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ANIMALS

• During the 65 billion years of the Cenozoic era,
  or age of mammal. invertebrates , fish ,
  reptiles, etc were essentially of modern types.
  But, mammals, birds, protozoa and flowering
  plants still evolved and developed during this
  period.

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climate

• In the Cenozoic era the climate was warm and
  mild. But, then later much more land was expose.
  Because much of the water became ice ocean levels
  drop.

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PERIODS

• The Cenozoic was divided in to two eras the
  tertiary which made up the bulk of the Cenozoic
  era. And the quaternary, which is only the last
  one and a half million years.