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The Precambrian Period
EVENT 1 Earth Forms slowly and becomes whole. EVENT 2 Fossils are rare and unique. -
Period: to
EKho7
Geological Timescale -
The Cambrian Period
EVENT 1 First vertebrates appear.EVENT 2 Trilobites are common. -
The Ordovician Period
EVENT 1 Echinoderms appear. EVENT 2 Graptolites flourish. -
The Silurian Period
EVENT 1 Eurypterids appear. EVENT 2 Animals appear. -
The Devonian Period
EVENT 1 amphibians appear. EVENT 2 giant horses appear. -
The Mississippian Period
EVENT 1 amphibians flourish. EVENT 2 forest and swamps cover most land. -
The Pennsylvanian Period
EVENT 1 giant cockroaches and dragonflies are common. EVENT 2 reptiles appear. -
The Permian Period
EVENT 1 Pangaea comes together. EVENT 2 mass extinctions mark the end of the Era. -
The Triassic Period
EVENT 1 Dinosaurs appear. EVENT 2 ammonites are common. -
The Jurassic Period
EVENT 1 dinosaurs are the dominant life form. EVENT 2 Primitive birds and flying reptiles appear. -
The Cretaceous Period
EVENT 1 Flowering plants and modern birds. EVENT 2 mass extinctions mark the end of the Mesozoic Era. -
The Paleocene Period
EVENT 1 age of mammals beings. EVENT 2 first primates appear. -
The Eocene Period
EVENT 1 Horses, flying squirrels appear. EVENT 2 Bats and whales appear. -
The Oligocene Period
EVENT 1 Dear, pigs, camels appear. EVENT 2 cats and dogs appear. -
The Miocene Period
EVENT 1 Grazing herds are abundant. EVENT 2 Raccoons and wolves appear. -
The Pliocene Period
EVENT 1 Large Carnivores appear. EVENT 2 Climatic cooling increased. -
The Pleistocene epoch
EVENT 1 woolly mammoths appear. EVENT 2 Rhinos and humans appear. -
The Holocene Epoch
EVENT 1 the last glacial period ends. EVENT 2 Complex human societies develop. -
The Anthropocene Period
EVENT 1 Nuclear tests. EVENT 2 domesticated chickens.