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precambrian period, 4.6 billion years ago
- the presence of stromatolites indicates that shallow seas covered much of the earth during intervals this period. 11. nearly half of the valuable mineral deposits in the world occur in the rocks of this period.
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Period: to
E Pfundstein p.7
geolgical 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 invertebrates appear, fish did not have jaws or teeth and their bodies were covered with bony plates. -
silurian period, 444 million years
24, eurypterids (sea scorpions), sea stars and coral came more common. 33, vascular land plant 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 the water and spend time on land form. -
mississippian epoch, 359 million years ago
2, Swamps and forests cover the land
21,Early reptiles resembling lizards appear. -
Pennsylvanian epoch, 318 million years ago
4, Giant cockroaches appear 15, Coal deposits form. -
permian 299 million years ago
8, Appalachian Mountains are created because of the collision of tectonic plates & savannahs form. 38, Environmental change causes mass extinction of sea invertebrates (trilobites & eurypterids) as the seas retreat. -
Triassic, 251 million years ago
16, Welcome to the world of the dinosaur! Enter the squirrel-sized dinosaur & the first forest dwelling mammals appear. 34, Ichthyosaurs are living in the ocean, new invertebrates called smmonite develop. -
Jurassic, 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 - carnivors and herbivores have arrived. -
Cretaceous, 146 million years ago
5, First flowering plants appear- angiosperm. 35, Impact hypothesis- dinosaur mass extinction. -
Paleocene, 65.5 million years ago
12, First primates evolve
29, Small rodents evolve -
Eocene, 55.8 million years ago
17, Flying squirrels, whales and bats appear
25, World wide temperatures drop about 4 degrees celsius (39.2 degrees farenheit) -
Oligocene, 33.9 million years ago
6, Himalayas develop due to uplifting caused by the Indian subcontinent and Eurasian continents colliding.
27, Many early mammals become extinct, clams and snails flourish -
Miocene, 23 million years ago
32, Antarctic ice caps begin to form.
36, Mediterranian Sea dries up and refills several times due to tectonic forces and dropping sea levels. -
Pliocene, 5.3 million years ago
20, Species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct (dire wolf & giant ground sloth) 36, Mediterranean Sea dries up and refills several times due to tectonic forces and dropping sea levels -
Pleistocene 1.8 million years ago
9, Homosapien (modern humans) appeared & are hunters 25, World wide temperatures drop about 4 degrees celsius (39.2 degrees fahrenheit) -
Holocene 0.0115 million years ago
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 (Present)
7, Some scientists believe that human kind has caused mass extinctions of plant and animal species, polluted the oceans and altered the atmosphere. 14, This 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
