Geologic Timeline

We will use 100 meters on the track to represent the age of the Earth. To do this the time in years below must be converted to meters. Complete the list below so we can do this mapping.

Meters Million years ago Event
100 4500 Earth forms
  3800 age of oldest rock
  3500 first bacteria (1st fossils)
  600 first jellyfish
  570 Gondwana forms
  543 first trilobites
  540 land plants appear
  515 first vertebrates
  480 Taconic orogeny (Appalachian Mtns.)
  475 first fish
  420 land animals, sharks and spiders appear
  370 ferns appear
  340 first seed plants
  310 first reptiles
  300 first winged insects and first earthworms
  250 greatest mass extinction / Pangaea
  245 first dinosaurs
  225 first mammals
  200 birds appear
  125 first flowering plants
  100 first ants
  70 Laramide orogeny (Rocky Mtns.)
  65 Tyrannosaurus; dinosaurs become extinct
  60 first primates
  55 rabbits appear
  36 Cascade orogeny
  20 grasses appear
  4 human ancestors appear
0 0 Today