-
Precambrian
• Medditeranian sea dries up and refills several times due to tectonic forces and dropping sea
• Himalayas develpos due to uplifting caused by the indian subcontinent and eurasian continents colliding -
Period: to
D Posada
Geological Timescale -
Cambrian
• Trilobites appear
• Shallow seas covered much of the earth -
ordovician
• There is very little life plant during this period
• Environmental changes cause mass extinction of sea invertebrates as the sea retreats -
silurian
• Eurypterids, sea stars and coral become more common
• Vascular land plants and animals begin to evolve on land -
devonian
• Fishes that can breath out of the water and spend time on land form
• Huge plants begin to develop, early amphibians form -
missisipian
• tiny invertabrates flourished, fish didn't have jaws or teeth, and their bodies were covered by plates
* swamps and forests covered the land -
pennsylvenian
• Giant cockroaches appear
• coal Deposits form -
permian
• appalachian mountains are created
• Nearly half of the valuable mineral deposits in the world occcured during this epoch -
triassic
• First forests dwelling mammals appear
• New invertebrates called ammonites develop -
jurrasic
• Flying reptiles are in the air
• Carnivores and Herbivores are now a thing -
cretaceous
• First flowering plants appear
• Dinosaur Mass extinction -
paleocene
• First primates evolve
• Various species migrate between continents -
Eocene
• flying squirrels, whales and bats
• First modern horses appear -
Olgiocene
• Small rodents evolve
• Many early mammals become extinct -
miocene
• Small rodents evolve
• Many early mammals become extinct -
pliocene
• Species that couldn't handle the cold moved or died out
• Temperatures dropped 4 degrees -
pleistocene
• Modern Humans appear
• Arctic Ice caps begin to form -
Holocene
• Modern humans develop agriculture
• The last glacial period ended and sea level rose -
Anthropocene
• human kind has caused mass extinctions and polluted the oceans
• Began either in the 1800s or 1950s
