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Precambrian Period, 4.6 billion years ago
10 The presence of stromatolites indicates that shallow seas covered much of the 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
G Tula p3
geological timescale -
Cambrian Period, 542 million years ago
22 trilobites appear 23 shelled brachiopods appear -
Ordovician Period, 488 million 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 jaws or teeth and their bodies were covered with bony plates. -
Silurian Period, 444 million years ago
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 Period, 416 million years ago
31 Huge plants begin to develop, early amphibians form 37 Age of fishes, fish that can breath out of water and spend time on land form -
Mississippian period, 359 million years ago
2 swamps and forests cover the land 15 coal deposits form -
Pennsylvanian Period, 318 million years ago
4 Giant cockroaches appear 21 Early reptiles resembling lizards appear -
Permian period, 299 million years ago
8 Appalachian Mountains are created because of the collision pf tectonic plates & savannahs form 38 environmental change causes mass extinction of sea invertebrates (trilobites & eurypterids) as the seas retreat -
Triassic period, 251 million years ago
16 welcome to the world of dinosaur! Enter the squirrel sized dinosaur & the first forest dwelling mammals appear 34 Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop -
Jurassic period, 200 million years ago
3 Flying reptiles called pterosaurs are in the air now 13 Whoa those dinos are getting big & dominate the land - lizard-hipped and bird-hipped appear - carnivores and herbivores have arrived -
Cretaceous period, 146 million years ago
5 First flowering plants appear - angiosperm 35 impact hypothesis - dinosaur mass extinction -
Paleocene period, 65.5 million years ago
12 first primates evolve 29 small rodents evolve -
Eocene period, 55.8 million years ago
17 Flying squirrels, whales and bats appear 25 world wide temperatures drop about 4 degrees celsius (39.2 degrees fahrenheit) -
Oligocene period, 33.9 million years ago
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 -
Miocene period, 23 million years ago
32 Antarctic icecaps begin to form 36 Mediterranean Sea dries up and refills several times due to tectonic forseca dn dropping sea levels -
Pliocene period, 5.3 million years ago
18 Various species migrated between continents across land bridges 26 First modern horses appear -
Pleistocene period, 1.8 million years ago
9 Homosapien (modern humans) appeared & are hunters 20 Species that did not evolve to survive extreme cold moved to warmer climate areas pr become extinct (dire wolf & giant ground sloth) -
Holocene period, 0.0115 million years ago (11,500)
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 period, current time
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 an 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
