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Quaternary
- The last glacial ended and sea levels rose, great lakes formed. 9 Homosapien (modern humans) appeared and are huters.
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Period: to
R De Leon P-3
Geological Timescale -
Period: to
Tertiary
- First modern horses appear. 17.Flying squirrels, whales and bats appear.
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Period: to
Tertiary
- First primates evolve. 29. Small rodents envolve.
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Period: to
Tertiary
- There very a little plant life during this period.5.First flowering plants appear-angiosperm.
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Period: to
Jurassic
- Whoa those are getting big and dominate the land- lizzard hipped and bird hipped appear- carnivores and herbivores have arrived. 16.Welcome to the world of the dinosaur enter the squirrel sized dinosaur and the first forest dwelling mamals appear.
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Period: to
Jurassic
4.Giant cockroaches appear. 21.Early reptiles resembling large lizards appear. -
Period: to
Carboniferous
2.Swamps and forests cover the lad. 3.Flying reptiles called pterosaurs are in the air now. -
Period: to
cambrian
- Ages of fishes, fish that can breath out of the water and spend time on land form. 10. The presence of stromatoloties indicates that shallow seas covered much of earths during intervals in this period.
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Period: to
cambrian
- Shelled brachiopods appear. 22. Trilobites appear.
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Period: to
cambrian
- Eurypterids,sea stars and coral become more common.
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Period: to
ordovician
- Colonies of tiny invertebrates call graptolites florished and vertibrates appear, fish did not have jaws or teeth and their bodies were covered with bony plates. 7. Some scientists believe that human kind has caused mass extinctions of plants and animal species, polluted the oceans and altered the atmosphere.
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Period: to
siluvian
- Many mammals become to extinct, clams and snails flourish. 28. Modern humans developed agriculture and used tools made of iron and bronze.
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Period: to
siluvian
- Vascular land plants and animals, such as scorpions begin to envolve on land. 31. Huge plants begin to develop, early amphibians form.
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Period: to
Devonia
35.Impact hphothesis- dinosaur mass extinction. 32.Antarctic icecaps begin to form. -
Period: to
carboniferous
- Various species migrated between continents across land bridges. 20.Species that did not evolve to survive extreme cold moved to warmer climates areas or became extinct.
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Period: to
Permian
15.Coal deposits form. 11.Nearly half of the valuable mineral deposits in the world occur in the rocks of this period. -
Period: to
Permian
8.Appalachian Mountains are created because of the collision of tectonic plates and savannahs form. 6.Himalayas develope due to uplifting caused by Indian subcontinents colliding. -
Period: to
Late Proterozoic
- Mediterranean Sea dries up and refills several times due to tectonic forcesa and dropping sea levels. 38.Environmental change causes mass extinction of sea invertebrates as the seas retreat.