Eras

By edgar.kenna
  • 3650 BCE

    E

    Earliest evidence of life (heterotrophic, prokaryotic bacteria)
  • 2500 BCE

    F

    First photosynthetic/autotrophic bacteria appear
  • 2200 BCE

    G

    First Great Extinction, oxygen-producing bacteria "poison" the environment, age of aerobic organisms begins
  • 1750 BCE

    H

    First Eukaryotes appear
  • 650 BCE

    I

    Sexual reproduction begins
  • 650 BCE

    J

    Multicellular life appears
  • 550 BCE

    K

    "Cambrian Explosion"---huge diversity and complexity increase in a relatively short period of time
  • Period: 550 BCE to 3650 BCE

    D

    Precambrian
  • 505 BCE

    L

    Marine invertebrates appear
  • 438 BCE

    M

    Great Extinction, fish appear
  • 408 BCE

    N

    Land plants appear
  • 360 BCE

    O

    Great Extinction, amphibians appear
  • 286 BCE

    P

    Reptiles appear
  • 245 BCE

    Q

    Great Extinction, seed plants appear
  • Period: 245 BCE to 66 BCE

    B

    Mesozoic
  • Period: 245 BCE to 550 BCE

    C

    Paleozoic
  • 208 BCE

    R

    Great Extinction, mammals and dinosaurs appear
  • 144 BCE

    S

    Primitive birds appear
  • 66 BCE

    T

    Great Extinction, dinosaurs disappear
  • 60 BCE

    U

    Primates appear
  • 38 BCE

    V

    Anthropoids (day--active primates) appear
  • 37 BCE

    W

    Primitive horses appear
  • 1 CE

    X

    Humans appear
  • 1 CE

    Y

    Historical date of Jesus' birth
  • 1 CE

    Z

    USA's declaration of independence
  • Period: to 66 BCE

    A

    Cenozoic