-
Period: to
Batista p1
Geological Timescale -
Precambrian Time 4.600
11-Nearly alf of the valuable mineral deposits in the world occur in the rocks of this period.
22-Trilobites appear -
Cambrian Period 542
7-Some scientists believe that human kind has caused mass extinctions of plant and animal species, polluted the oceans and altered the atmosphere.
38-Environmental change causes mass extinction of sea invertibrates (trilobites & eurypterids) as the seas retreat. -
Ordovician Period 488
25-World wide temperatures drop about 4 degrees celsius (39.2 degrees fahrenheit).
30-Colonies of tiny invertebrates call graptolites florished and vertebrates appear, fish did not have jaws or teeth and their bodies were covered with bony plates. -
Silurian Period 444
23-Shelled brachiopods appear.
24-Eurypterids (sea scorpions), sea stars and coral become more common. -
Devonian Period 416
1-There is a very little plant life during this period.
37-Age of fishes, fish that can breath out of the water and spend time on land form. -
Mississippian Period 359
2-Swamps and forests cover the land.
10-The presence of stromatolites indicates that shallow seas covered much of Earth during intervals in this period. -
Pennsylvanian Period 318
4-Giant cockroaches appear.
15-Coal deposits form. -
Permian Period 299
8-Apallachian Mountains are created because of the collision of tectonic plates & savannahs form.
28-Modern human develop agriculture and used tools made of bronze and iron. -
Triassic Period 251
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
3-Flying reptiles called pterosaurs are in the air now.
13-Whoa those dinos are getting big & dominate land - Lizard-Hipped and bird-hipped appear - carnivores and herbivores have arrived. -
Cretaceous Period 146
33-Vascular land plants and animals, such as scorpions begin to evolve on land.
35-Impact hypothesis - dinosaur mass extinction. -
Paleocene Epoch 65.5
12-First primates evolve.
17-flying squirrels, whales and bats appear. -
Eocene Epoch 55.8
19-The last glacial period ended and sea levels rose, Great lakes formed.
26-First modern horses appear -
Miocene Epoch 23.0
32-Antartic icecaps begin to form.
36-Mediterranean sea dries up and refills several times due to tectonic forcesa dn dropping sea levels. -
Pilocene Epoch 5.3
5-First flowering plants appear - angiosperm
20-Species that did not evolve to survive extreme cold moved to warmer climates areas or became extinct (dire wolf & giant ground sloth) -
Pleistocene Epoch 1.8
18-Various species migrated between continent across land bridges.
21-Early reptiles resembling large lizards appear. -
Holocene Epoch 0.0115
6-Himalayas develop due to uplifting caused by the Indian subcontinent and Eurasian continents colliding.
9-Homosapien (modern humans) appeared & are hunters.
