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Precambrian Period
10.) The presence of stromatolites indicates the shallow seas covered much of Earth during intervals in this period. 11.) Nearly half of the valuable minerals deposits in the world occur in the rocks of this period. -
Period: to
J Goins P.1
Geological Timescale -
Cambrian Period
22.) Trilobites appear 23.) Shelled brachiopods appear -
Ordovician Period
1.) There is very little plant life during this period. 30.) Colonies of tiny invertebrates call graptolites flourished and their bodies were covered with bony plates. -
Silurian Period
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
31.) Huge plants begin to develop, early amphibians. 37.) Age of Fishes, fish that can breath out of water and spend time on land form. -
Mississippian Period
2.) Swamps and forests cover the land. 21.) Early reptiles resembling large lizards appear. -
Pennsylvanian Period
4.) Giant cockroaches appear 15.) Coal deposits form -
Permian Period
8.) Appalachian Mountains are created because of the collision if tectonic plates & savannahs form. 38.) Enviromental change causes mass extinction of sea invertibrates (trilobites & eurypterids) as the sea retreat. -
Triassic Period
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 call ammonite develop. -
Jurassic Period
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 Period
5.) First flowering plants appear angiosperm. 35.) Impact hypothesis dinosaur mass extinction. -
Paleocene Period
12.) First primates evolve. 29.) Small rodents evolve. -
Eocene Period
17.) Flying squirrels, whales and bats appear. 25.) World wide temperatures drop about 4 degrees celsius (39.2 degrees fahrenheit) -
Oligocene Period
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 Period
32.) Antarctic icecaps begin to form. 36.) Mediterranean Sea dries up and refills several times due to tectonic forcesa an dropping sea levels. -
Pliocence Period
26.) First modern horses appear. 28.) Modern human develop agriculture and used tools made of bronze and iron. -
Pleistocene Period
18.) Various species migrated between continents across land bridges.
20.) Species that did not evolve to survive extreme cold moved to warmer climate areas or become extinct (dire wolf & giant ground areas.) -
Holocene Period
9.) Homosapien (modern humans) appeared & are hunters. 19.) The last glacial period ended and sea levels rose, Great Lakes formed. -
Anthropocence Period
7.) Some scientist believe that human kind has caused mass extinctions because polluted the oceans and altered the atmosphere.
14.) 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.
