-
Cambrian Period
1 There is very little plant life in this period #23 Shelled brachiopods appear -
Period: to
GMaldonadoP7
Geological Timescale -
Carboniferous
2 Swamps and forests cover the land #21 Early reptiles resembling large lizards appear -
Jurassic
3 Flying reptiles called pterosaurs are in the air now #13 Lizard- Hipped and Bird-Hipped appear- carnivores and herbivores have arrived -
Cretaceous
5 First flowering plants appear- angiosperm #35 Impact hypothesis- dinosaur mass extinction -
Oligocene
#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 -
Triassic
16 Squirrel sized dinosaur and the first forest dwelling mammals appear #34 each ichthyosaurs are living in the ocean, new invertebrates call ammonite develop -
Eocene
17 Flying squirrels, whales and bats appear #29 small rodents evolve -
Holocene
19 The last glacial period ended and seal levels rose, Great Lakes formed #28 Modern Human developed agriculture and used tools made of bronze and iron -
Silurian
24 Eurypterids (Sea Scorpions), Sea stars and coral become more common # 33 Vascular land plants and animals, such as scorpians begin to evolve on land -
Devonian
31 Huge plants begin to develop, early amphibians form #37 Age of Fishes, Fish that can breathe out of the water and spend time on landform -
Pliocene
18 Various species migrated between continents across land bridges #26 First modern horses appear -
Miocene
32 Antarctic icecaps begin to form # 36 Mediterranean Sea drys up and refills several times due to tectonic force and dropping sea levels -
Pleistocene
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 sloth) -
Precambrian
10 the presence of stromatolites indicates the shallow seas covered much of earth during intervals in this period #11 nearly half of the valuable mineral deposits in the world occur in the rocks of this period -
Paleocene
12 First primates evolve #25 World wide temperature dropped about 4 degrees celsius (39.2 degrees fahrenheit) -
Permian
8 Appalachian Mountains are created because of the collision of tectonic plates and savannah's form #38 environmental change causes mass extinction of sea invertebrates (trilobites and eurypterids) as the seas retreat -
Ordovician
22 Trilobites appear #30 Colonies of tiny invertebrates call graptolites flourished and vertebrates appear, fish didn't have jaws or teeth and their bodies were covered with bony parts -
Pennsylvanian
15 Coal Deposits form #4 Giant Cockroaches Appear -
Anthropocene
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 scientists think it began with the industry age in the early 1800s others think it began with the atomic age in the 1950s
