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Precambrian
The presence of stromatolites indicates that shallow seas covered much of Earth during intervals in this period. Nearly half of the valuable mineral deposits in the world occur in the rocks of this period. -
Period: to
S Farley Pd.3
Geological Timescale -
Cambrian
Trilobites appear Shelled brachiopods -
Ordovician
There is very little plant life during this period. Colonies of tiny invertebrates call graptolites florished vertibrates apper, Fish did not have jaws or teeth and their bodies were covered with bony plates. -
Silurian
Eurypterids (sea scorpions), sea stars and coral become more common. Vascular land plants and animals, such as scorpions begin to evolve on land -
Devonian
Huge plants begin to develop, early amphibians form. Age of fishes, fish that can breath out of water and spend time on land form. -
Mississppi period ]
Swamps and forest cover the land. Gian cockroaches appear. -
Pennsyianian period
Coal deposits form. Early replies resembling large lizards appear. -
Permian
Appalachian Mountains are created because of the collision of tectonic plates and savannah form. -
Triassic
Welcome to the world of the Dinosaur! Enter the squirrel sized dinosaur and the first forest dwelling mammals appear. Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop. -
Jurassic
Whoa those dines are getting big and dominate the land - lizard hipped and bird-hipped appear - carnivores and herbivores have arrived. -
Jurassic
Whoa those dines are getting big and dominate the land - lizard hipped and bird-hipped appear - carnivores and herbivores have arrived. -
Cretaceous
First flower plants appear - angiosperm -
Paleocene
First primates evolve. Small rodents evolve. -
Eocene
Flying squirrels, whales and bat appear -
Oligocene
Himalayas develop due to uplifting caused by the Idian subcontinent and eurasian continents colliding. Many early mammal become extinct, clams and snails flourish. -
Miocene
Mediterranean sea dries up and refills several times due to tectonic forces dn dropping sea levels -
Pliocene
Various species migrated between continents across land bridges. First modern hopes appear. -
Pleistocene
Homosapien (modern humans) appeared and are humans Various species migrated between contents across land bridges. -
Holocene
The last glacial period ended and sea levels rose, Great Lakes formed . -
Anthropocene
Some scientists believe that humans kind has caused mass extinctions 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 early1800s other think it began with the atomic age in 1950s