-
Geological Timescale
-
Event 10: Presence of stromotalites indicates that shallow seas covered much of Earth during intervals in this period.. Event 11 Nearly half the valuable mineral deposits in the world occur in the rocks of this period..
-
Event 22 Trilobites appear. Event 23 Shelled brachipods appear.
-
Event 1: there is very little plant life during this period. Event 30 colonies of tiny invertebrates call graptolites flourished and vertebrates appear, Fish did not have jaws or teeth and their bodies were covered with bony plates.
-
Event 24 Euryptids, sea stars and coral become more common. Event 34 Vascular land plants and animals, such as scorpions begin to evolve on land.
-
Event 31 Huge plants begin to develop. early amphibians form Event 37 Age of fishes, fish that can breath out of the water and spend time on land form
-
Event 2 Forests and swamps cover most of the land. Event 21 Early reptiles appear resembling large lizards appear.
-
Event 4 Giant cockroaches appear. EVent 15 Coal Deposits form
-
Event 8 Appalachian mountains are created because of the collision of tectonic plates & savannahs form. Event 38 Environmental changes mass extinction of sea invertebrates (trilobites & eurypterids) as the seas retreat.
-
Event 16 Welcome to the world of dinosaur! enter the squirrel sized dinosaur & the first forest dwelling mammals appear. Event 34 Ichthysaurs are living in the ocean, new invertebrates call ammonite develop.
-
Event 3 Flying reptiles called ptersaurs are in the air now. Event 13 Whoa those dinos are getting big & dominate the land. Lizard hipped and bird-hipped appear-carnivores and herbivores have arrived.
-
Event 5 First flowering plants appear angiosperm. Event 35 Impact hypothesis- dinosaur mass extinction
-
Event 12 First primates evolve Event 29 Small rodents evolve.
-
Event 17 Flying squirrels, whales, bats appear Event 25 World wide temperatures drop about 4 degrees Celsius.
-
Event 6 Himalayas develop due to uplifiting caused by the indian subcontinent and eurasian continents colliding Event 27 Many early mammals become extinct, clams and snails flourish.
-
Event 32 Antartic icecaps begin to form. Event 36 Mediteranean sea dries up and refills several times due to tectonic forces and dropping sea levels
-
Event 18 Various species migrated between continents across land bridges. Event 26 First modern horses appear.
-
Event 9 Homosapien modern humans appeared & are hunters. Event 20 Species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct ( dire wolf, giant ground sloth).
-
EVent 19 The last glacial period ended and sea levels rose great lakes formed. Event 28 Modern human developed agriculture and used tools made of bronze and iron
-
Event 7 some scientists believe that human kind has caused mass extinctions of plant and animal species polluted the oceans and altered the atmosphere. Event 14 There is argument as to when this epoch started some scientists think it began with the industrial age in early 1800s others think it began with the atomic age in 1950s.
