-
precambrian 4600
18-various species migrated between continents across land bidges -
Period: to
H class period- 3
geological timescale -
cambrian 542
22-trilobites appear 23- shelled brachiopods appear -
ordovician 488
27- many early mammal become extinct , clams and snails flourish -
silurian 444
33- Vascular land plants and animals such as scorpions begin to evolve on land 24-euryptedis sea stars and coral become more extincts -
devonian 416
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 -
carboniferous 359
2- swamps and forest cover the land 26- first modern horses appear -
triassic 251
16- welcome to the word of the dinosaur enter the squirrel sized dinosaur and the first forest dwelling mammals appear 34-ichthyosaurs are living in the oceans . -
jurassic 200
3- flying reptiles called pterosaurs are in the air now 13- whoa those dinos getting big dominated the land lizard hipped appear carnivores and herbivores have arrived -
cretaceous 146
5-first flowering plants appear 38- environmental change causes mass extinctions of sea invertibrates -
paleocene 65.5
12- first primates appear 29- small rodents evolve -
eocene 55.8
17-flying squirrels whales and bats appear 25- world wide temperatures drop about 4 degrees celsius -
oligocene 33.9
6- himalayas develop due to uplifting caused by the indian subcontinent and eurasian continents colliding 27- many early mammals become extinct clams and snails flourish -
miocene 23.0
32- antartic icecaps begin to form 36-mediterranean sea dries up and refills several ties due to tectonic forces dn dropping sea levels -
pliocene 5.3
26- first modern horses appear 18-various species migrated between continents across land bridges -
pleistocene1.8
20-species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct ( dire wolf giant ground sloth 9- homosapien appeared are hunters -
holocene 0.0115
19- the last glacial period ended and sea levels rose great lakes formed 28- modern humans developed agriculture and use tools made of bronze and iron
