-
Precambrian Era (4,600 ma years ago)
10 The presence of stromatolites indicates that shallow seas covered much of earth during intervals in this period. 11 Nearly half of the valuable mineral deposits in the world occur in the rocks of this period. -
Period: to
B.Prophete 4th period
Geological Timescale -
Cambrian Period (542 ma years ago)
22 Trilobites appear. 23 Shelled brachiopods appear. -
Ordovician period (488 ma years ago)
1 there is very little plant life during this period. 30 Colonies of tiny invertebrates call graptolites flourished and vertebrates appear, fish did not have any jaws or teeth and their bodies were covered with bony plates. -
Silurian Period (444 ma years ago)
33 Vascular land plants and animals, such as scorpions begin to evolve on land. 24 Eurypterids (sea scorpions), sea stars and coral become more common. -
Devonian (416 ma years ago)
31 Huge plants begin to develop, early amphibians form 37 Age of fishes, fish that can breath out of the water and spend time on land form. -
Mississippi Period (359 ma years ago)
2 Swamps and forest cover the land. 21 Early reptiles resembling large lizards appear. -
Pennsylvanian Period ( 318 ma years ago)
4 Giant cockroaches appear 15 coal deposits form -
Permian Period (299 ma years ago)
8 Appalachian Mountains are created because of the collisions of tectonic plates and savannahs form. 38 Environments change causes mass extinction of sea invertebrates(trilobites & eurypterids) as the seas retreat. -
Triassic Period (251 ma years ago)
16 welcome to the world of the dinosaurs! enter the squirrel sized dinosaurs & the fish forest dwelling mammals appear. 34 Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop. -
Jurassic Period (200 ma years ago)
13 whoa those dinos are getting big and dominate the land - lizard-hipped and bird- hipped appear - carnivores and herbivores have arrived. 3 Flying reptiles called pterosaurs are in the air now. -
Cretaceous Period (146 ma years ago)
35 Impact hypothesis - dinosaurs mass extinction. 5 First flowering plants appear - angiosperm -
Paleocene Epoch (65.5 ma years ago)
12 First primates evolve. 29 small rodents evolve -
Eocene Epoch (55.8 years ago)
17 Flying squirrels, whales and bats appear. 25 World wide temperature drops about 4 degrees celsius (39.2 degrees fahrenheit) -
Oligocene Epoch
6 Himalayas develop due to uplifting caused by the indian subcontinent and eurasian continents colliding. 27 many early mammals became extinct, clams and snails flourish -
Miocene Epoch ( 23.0 ma years ago)
32 antarctic ice caps begin to form 36 Mediterranean sea dries up and refills several times due to plate tectonic forces and dropping sea levels. -
Pliocene Epoch ( 5.3 ma years ago)
18 various species migrated between continents across land bridges. 26 First modern horses appear. -
Pleistocene Epoch (1.8 ma years ago)
9 Homosapien (modern humans) appeared & and hunters 20 species that did not evolve to survive extreme cold moves to warmer climates areas or became extinct -
Holocene Epoch (.0115 years ago)
19 the last glacial period ended and sea levels rose, the great lakes formed 28 Modern human developed agriculture and used tools made of bronze and iron. -
Anthropocene Epoch ( Modern Day)
7 some scientist believe that human kind has caused mass extinctions of plants and animal species, polluted the oceans and altered the atmospheres. 14 there is argument as to when this epoch began, somen scientist think it began with the industrial age in the early 1800s others thin it began with the atomic age in the 1950s
