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10 The presence of stromatolites idicates the shallow seas covered much of Earth during intervals in this period.
11 Nearly half of the valueble mineral deposits in the world occur in the rocks of this period. -
Geological Timescale
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1 There is very little plant life during this period.
23 Shelled brachiopods appear. -
22 Trilobites appear.
30 Colonies of tiny invertebrates call graptolites florish and vertibrates appear, fish did not have jaws or teeth and their bodies were covered with bony plates. -
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. -
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. -
2 Swamps and forests cover the land.
21 Early reptiles resembling large lizards appear. -
4 Giant cockroaches appear.
15 coal deposits form. -
8 Appalachian Mountains are created because of the collision of tectonic plates and Savannah's form.
38 Environmental change causes mass extinction of sea invertibrates (trilobites and eurypterids) as the sea retreat -
16 Welcome to the world of the Dinosaur! Enter the squirrel sized dinosaur and the first forest dwelling mammals appear.
34 Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop. -
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. -
5 First flowering plants appear - angiosperm.
35 impact hypothesis - dinosaurs mass extinction. -
12 First primates evolve.
25 World wide temperatures drop about 4 degrees celsius (39.2 degrees fahrenheit). -
17 flying squirrels, whales and bats appear.
29 Small rodents evolve. -
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. -
32 Antarctic icecaps begin to form.
36 Mediterranean sea dries up and refills several times due to tectonic forcesa dn dropping sea levels. -
18 Various species migrated between continents across land bridges.
26 First modern horse appear. -
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 ground sloth). -
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. -
7 Some scientist believe that human kind has caused mass extinctions of plant and animal species, polluted the oceans an altered the atmosphere.
14 There 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.
