-
Precambrian 4,600 MA
10.) the presence of stromatolites indicate that 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 -
Period: to
C.colasuonno p.1
Geological Timescale -
Cambrian 542 MA
22.) Trilobites appear
23.) Shelled brachiopods appear -
Ordovician 488 MA
1.) There is very little plant life during this period
30.) Colonies of tiny invertebrates call grapolites florished and vertibrates appear, fish did not have jaws or teeth and their bodies were covered with bony plates. -
Silurian 444 MA
24.) Eurypterids (sea scorpions), sea stars and coral become more common.
33.)Vascular land plants and animals, such as scorpions begin ti evolve on land. -
Devonian 416 MA
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 land form. -
Mississpian Period 359 MA
2.) Swamps and forests cover the land
21.)Early reptiles resembling large lizards appear. -
Pennsylvanian Period 318 MA
4.) Giant Cockroaches appear.
15.) Coal deposits form -
Permian 299 MA
8.) Appalachian Mountains are created because of the collision of techtonic plates and savanas form.
38.) Enviromental change causes mass extinction of sea invertibrates (Trilobites & europterids) as the seas retreat. -
Triassic 251 MA
16.) Welcome to the world of the Dinosaur! Enter the squirrel-sized dinosaur and the first forest dwelling mammals appear.
34.) Inchthyosaurs are living in the ocean, new invertebrates call ammonite develop. -
Jurassic 200 MA
3.) Flying reptiles called pterosaurs are in the air now.
13.) Whoa, those dinos are getting big and dominate the land- Lizard-hipped and bird-hipped appear - carnivores and herbivores, have arrived. -
Cretaceous 146 MA
5.) First flowered plant appears.
35.) Impact hypothesis-dinosaur mass extinction. -
Cretaceous 146 MA
12.) First primates evolved.
29.) Small todents evolve. -
Eocene 55.8 MA
17.) flying squirrels, whales and bats appear.
25.) Worldwide temperatures drop about 4 degrees celsius (39.2 Fahrenheit) -
Oligocene 33.9 MA
5.) The Himalayas develop due to uplifting, caused by the Indian subcontinent and Eurasian continents colliding.
27.)Many early mammals gbecome extinct, clams and snails flourish. -
Miocene 23 MA
32.) Antartica caps begin to form.
36.) Mediterransean sea dries up and refills several times due to tectonic forcesa dn dropping sea levels. -
Pliocene 5.3 MA
18.) Various species migrated between continents across land bridges.
26.)First horces appear. -
Pleistocene 1.8 MA
9.) homo Sapien (modern humans) appeared and are hunters.
20.) Species that didnot evolve to survive extreme cold moved to warmer climates areas or became extinct (direwolf and giant ground sloth) -
Holocene 0.0115 MA
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 Current date
7.) Some scientist believe that human kind has caused mass extinctions of plant and animal species, polluted the oceans and altered the atmosphere.
14.P) There is an argument as to when this epoch began, some scientist think it began with the industrial age in the early 1800's others think it began with the atomic age in the 1950's.
