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Pre cambrian time 4600 ma
10 The presence of stromatolites indicates that shallow seas covered much of earth during intervals in this period. 11 Nearly half of the valuable minerals deposits in the world occur in the rock of this period. -
Period: to
m leizaola p.8
geological timescale -
Cambrian time 542 ma
Shelled brachiopods appear. Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop. -
Ordovician time 488 ma
colonies of tiny invertebrates call graptolites flourished and vertebrates appear, fish did not have jaws or teeth and there bodies were covered with bony plates. -
Silurian time 444 ma
vascular land plants animals, such as scorpions began to evolve on land. Eurypterids(sews scorpion), sea stars and coral become more common. -
devonian
Age of fishes, fish that can breath out of the water and spend time on land from. -
missipian time 318 ma
swamps and forest cover the land -
pensilvania time 299 ma
Giant cockroaches appear. coal deposits form. -
permian time 299 ma
enviromental change causes mass exctincion of sea invertebrates (trilobites and eurypterids) as the seas retreat -
triassic time 251 ma
The very little plant life during this period. whoa those dines are getting big and dominate land- lizard hipped and bird-hipped appear -carnivores and herbivores have arrived -
jurassic time 200 ma
flying reptiles called pterosaurs are in the air now. -
cretaceous time 196 ma
first flowering plants appear. impact hypothesis-dinasaur mass extinction. -
paleocene time 65.5 ma
First primates evolve. small rodents evolve -
eocene time 55.8 ma
flying squirrels, whales an bats appear -
Oligocene period
Himalayas develop due to uplifting caused by the indian subcontinent and eurasian continents folding. many early mammal become extinct, clams and snails flourish. -
miocene time 23 ma
mediterranian sea dries up and refills several times due to tectonic plates forces dn dropping sea levels -
pliocene period
Various species migrated between continents across land bridges. first modern horses appear -
pleistocene period
species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct. modern humans appeared and are hunters. -
holocene time .0115 ma
the last glacial period ended and sea levels rose, great lakes formed. -
anthoropocene period
some scientist believe that human kind has caused mass exctinctions of plant and animal species, polluted the oceans and altered the atmosphere. there is argument as to when this epoch began, some scientist think it began with the industrial age in the early 1800s other think it began with the atomic age in the 1950s.
