-
Pre- combrian time 4600 ma
10 The presence of stromatolites idicates the shallow seas covered much of Earth during intervals in this period.
11 Nearly half of the valueble mineral deposits in the world occur in the rocks of this period. -
Period: to
N shulkin period 8
Geological Timescale -
Cambrian 542 ma
1 There is very little plant life during this period.
23 Shelled brachiopods appear. -
Ordovician 488 ma
22 Trilobites appear.
30 Colonies of tiny invertebrates call graptolites florish and vertibrates appear, fish did not have jaws or teeth and their bodies were covered with bony plates. -
Silurian 444 ma
24 Eurypterids (sea scorpions), sea stars and coral become more common.
33 Vascular land plants and animals , such as scorpions begin to evolve on land. -
Devonian 416 ma
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. -
Mississippian period 359 ma
2 Swamps and forests cover the land.
21 Early reptiles resembling large lizards appear. -
Pennsylvanian period 318 ma
4 Giant cockroaches appear.
15 coal deposits form. -
Permian 299 ma
8 Appalachian Mountains are created because of the collision of tectonic plates and Savannah's form.
38 Environmental change causes mass extinction of sea invertibrates (trilobites and eurypterids) as the sea retreat -
Triassic 251 ma
16 Welcome to the world of the Dinosaur! Enter the squirrel sized dinosaur and the first forest dwelling mammals appear.
34 Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop. -
Jurassic 200 ma
3 Flying reptiles called pterosaurs are in the air now.
13 whoa those dinos are getting big and dominate the land - Lizard hipped and bird - hipped appear - carnivores and herbivores have arrived. -
Cretaceous 146 ma
5 First flowering plants appear - angiosperm.
35 impact hypothesis - dinosaurs mass extinction. -
Paleocene 65.5 ma
12 First primates evolve.
25 World wide temperatures drop about 4 degrees celsius (39.2 degrees fahrenheit). -
Eocene 55.8 ma
17 flying squirrels, whales and bats appear.
29 Small rodents evolve. -
Oligocene 33.9 ma
6 Himalayas develop due to uplifting caused by the indian subcontinent and Eurasian continents colliding.
27 Many early mammal become extinct, clams and snails flourish. -
Milocene 23.0 ma
32 Antarctic icecaps begin to form.
36 Mediterranean sea dries up and refills several times due to tectonic forcesa dn dropping sea levels. -
Pliocene 5.3 ma
18 Various species migrated between continents across land bridges.
26 First modern horse appear. -
Pleistocene 1.8 ma
9 Homosapien (modern humans) appeared and are hunters.
20 Species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct (dire wolf and giant ground sloth). -
Holocene 0.0115 ma
19 The last glacial period ended and sea levels rose, Great lakes formed.
28 Modern human developed agriculture and used tools made of bronze and iron. -
Anthropocene
7 Some scientist believe that human kind has caused mass extinctions of plant and animal species, polluted the oceans an altered the atmosphere.
14 There is argument as to when this epoch began, some scientist think it began with the industrial age in the early 1800's other think it began with the atomic age in the 1950's.
