bio GEO TIME SC

• geologic time scale


  calendar of events
• geologic time scale


  earths history of life
• chronological order


  earths geo time scale is arranged in wht
• eon


  largest unit of time
• era


  unit of time shorter than an eon but longer than a period
• periods


  A unit of time shorter than an era but longer than epoch.
• epochs


  A unit of time shorter than a period but longer than an age
• precambrian

  542 M ago
• precambrian


  single-celled bacteria came into existence
• precambrian

  no life on land
• precambrian

  atmosphere begins to accumulate the O for higher- order animals to survive. (higher/lower)
• precambrian

  end of this era, is the rise of complex animals in the OCEAN
• precambrian


  that complex animal nga nagrise in the ocean . PC ERA
• paleozoic

  began with cambrian explosion
• paleozoic


  rapid period of speciation kicked off a long period of life flourishing on earth
• paleozoic


  living orgs from ocean moved towards land
• paleozoic

  end of this era, largest mass extinction
• paleozoic


  wiped out 75% of marine life and 70% life on land
• paleozoic


  first to magriate towards land; plants, then invertibrates and so on...
• age of dinosaurs


  mesozoic era
• mesozoic

  humid and tropical climate
• mesozoic


  green plants and lush sprouted all over the earth
• herbivores, small mammals

  in mesozoic era, they thrived and came into existence
• mesozoic

  what era "birds developed turned into dinosaurs"
• cenozoic

  65 million yrs ago to the present
• cenozoic


  final era of the geo timescale
• cenozoic


  era where smaller mammals survived and become dominant
• cenozoic


  climate is cool ad drier compared to that one era
• , cenozoic

  anwer what era, its name __ cuz its covered with glaciers bla bla
• cenozoic


  all species of life (+ humans) evolved troughout this era
• fossils


  evidence that organisms lived
• fossils


  remains like burrows, nests, and dino footprints
• U P R C R A

  six ways of fossilization
• Unaltered preservation

  organism is trapped in amber, hardened plant is being observed
• per mineralization

  aka petrification, organic content of bone and wood, are replaced by SILICA, CALCITE OR PYRITE. FORMING A ROCK-LIKE FOSSIL
• carbonization

  aka coalification, TWO OTHER ELEMENTS, are ionized and CArbon remained
• recrystallization


  hard parts, converted to more stable minerals or small to large crystals
• authigenic preservation


  molds and casts are formed after most of the organisms have been dissolved.
• type of fossils

  casts, petrified, original remains, carbon film, trace/ichnofossils
• molds substrate negative image of an organism