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Paleozoic Silurian
1 there is very little plant life during this period. 11 Nearly half of the valuable mineral deposits in the world occur in the rocks of this period. -
Hadean Eon Priscoan period.
10 The presence of stromatolites indicates that shallow seas covered much of earth during intervals in this period. 22 Trilobites appear. -
Cambrian
23 Shelled brachiopods appear 30 Colonies of tiny invertebrates call graptolites florished and vertebrates appear, fish did not have jaws of teeth and their bodies were covered with bony plates. -
Silurian
24 Eurypterids (sea scorpions), sea starts and coral become more common. 33 Vascular land plants and animal, such as scorpions begin to evolve on land. -
Devonian
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. -
Paleozoic Carboniferous Missisipian
2 Swamps and forests cover the land. 34 Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop. -
Paleozoic Carboniferous Pensilvannyan
4 Giant cockroaches appear. 15 Coal deposits form. -
Carboniferous Pennsylvanian
21 Early reptiles resembling large lizards appear. 38 Environmental change causes mass extinction of sea invertebrates (trilobites & eurypterids) as the seas retreat. -
Tertiary Paleocene
16 Welcome to the world of the dinosaur! Enter the squirrel sized dinosaur & the first forest dwelling mammals appear. 29 Small rodents evolve. -
Mesozoic Jurassic
3 Flying reptiles called pterosaurs are in the air now. 13 Whoa those dinos are getting big & dominate the land- Lizards hipped and bird-hipped appear- carnivore and herbivores have arrived. -
Mesozoic cretaceous
5 First flowering plants appear - angiosperm 35 Impact hypothesis- dinosaur mass extinction. -
Oligocene
6 Himalayas develop due to uplifting used by the indian subcontinent and Eurasian continents colliding. 12 First primates evolve. -
Teritary Eocene
17 Flying squirrels, whales and bats appear 26 Firs modern horses appear. -
Oligocene
27 Many early mammal become extinct, clams and snails flourish 32 antarctic icecaps begin to form. -
Permian
8 Appalachian Mountains are created because of the collision of tectonic plates & savannah form.18 Various species migrated between continents across land bridges. -
Permian
20 Species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct (dire wolf & giant ground sloth) 3 Flying reptiles called pterosaurs are in the air now. -
Quaternary pleistocene
9 Homosapien (modern humans) appeared & are hunters. 25 World wide temperatures drop about 4 degrees celsius (39.2 degrees fahrenheit) -
Devonian
19 The last glaciar period ended and sea levels rose, Great lakes formed. 28 Modern human developed agriculture and used tools made of bronze and iron. -
Cretasius
7 Some scientists believe that human kind has caused mass extinctions of plant and animal species, polluted the oceans and 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.
