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Precambrian Time
The presence of stromatolites indicates that shallow seascovered much of Earth during intervals in this period (event 10). Nearly half of the valuable material deposits occur in the rocks of this period (event 11) -
Paleocene Epoch
First primates evolve (event 12). Small rodents evolve (event 29). -
Cambrian Period
Trilobites appear (event 22). Shelled brachiopods appear (event 23). -
Ordovician Period
There is very little plant life during this period (event 1). Colonies of tiny invertebrates called graptolites flourished and vertibrates appear. Fish didn't have jaws or teeth and their bodies were covered with bony plates (event 30). -
Silurian Period
Eurypterids, sea stars and coral became more common (event 24). Vascular land plants and animals, such as scorpions begin to evolve on land (event 33). -
Devonian Period
Huge plants begin to develop, early amphibians form (event 31). Age of Fishes, fish that can breathe out of water and spend time on land form. -
Mississippian Epoch
Swamps and forest cover the land (event 2). Early reptiles resembling large lizards appear (event 21). -
Triassic Period
Welcome to the world of the Dinosaur! Enter the squirrel-sized dinosaur and the first forest-dwelling mammals appear (event 16). Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop (event 34). -
Permian Period
Appalachian mountains are created because of the collision of tectonic plates and savannahs form (event 8). Environmental change causes mass extinction of sea invertibrates as the seas retreat (event 38). -
Jurassic Period
Whoa those dinos are getting big and dominate the land! Lizard-hipped and bird-hipped appear- carnivores and herbivores have arrived! (event 13) Flying reptiles called pterosaurs are in the air now (event 3). -
Pennsylvanian Epoch
Giant cockroaches appear (event 4). Coal deposits form (event 15). -
Cretaceous Period
First flowering plants (angiosperm) appear (event 5). Impact hypothesis- dinosaur mass extinction (event 35). -
Oligocene Epoch
Himalayas develop due to uplifting caused by the Indian subcontinent and Eurasian continents colliding (event 6). -
Eocene Epoch
Flying squirrels, whales, and bats appear (event 17). First modern horses appear (event 26). -
Pliocene Epoch
Various species migrated between continents across land bridges (event 18). World wide temperatures drop about 4 degrees celsius (event 25). -
Pleistocene Epoch
Homosapien appeared and are hunters (event 9). Species that didn't evolve to survive extreme cold moved to warmer climate areas or became extinct (event 20). -
Miocene Epoch
Antarctic icecaps begin to form (event 32). Mediterranian Sea dries up and refills several times due to tectonic forces and dropping sea levels (event 36). -
Holocene Epoch
The last glacial period ended and sea levels rose, the Great Lakes formed (event 19). Modern human developed agriculture and used tools made of bronze and iron (event 28). -
Anthropocene Epoch
There is argument as to when this epoch began; some scientists think it began in the early 1800s and others think it began in the 1950s (event 14). Some scientists believe that humankind has caused mass extinctions of plant and animal species, polluted the oceans, and altered the atmosphere (event 7).
