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The Precambrian Period
1 Earth Forms. 2 Fossils are rare. -
Period: to
V Huertas P7
geological timescale -
The Cambrian Period
1 First vertebrates appear. 2 Trilobites are common. -
The Ordovician Period
1 Echinoderms appear. 2 Graptolites flourish. -
The Silurian Period
1 Eurypterids appear. 2 Animals appear. -
The Devonian Period
1 amphibians appear. 2 giant horses appear. -
The Mississippian Period
1 amphibians flourish. 2 forest and swamps cover most land. -
The Pennsylvanian Period
1 giant cockroaches and dragonflies are common. 2 reptiles appear. -
The Permian Period
1 Pangaea comes together. 2 mass extinctions mark the end of the Era. -
The Triassic Period
1 Dinosaurs appear. 2 ammonites are common. -
The Jurassic Period
1 dinosaurs are the dominant life form. 2 Primitive birds and flying reptiles appear. -
The Cretaceous Period
1 Flowering plants and modern birds. 2 mass extinctions mark the end of the Mesozoic Era. -
The Paleocene Period
1 age of mammals beings. 2 first primates appear. -
The Eocene Period
1 Horses, flying squirrels appear. 2 Bats and whales appear. -
The Oligocene Period
1 Dear, pigs, camels appear. 2 cats and dogs appear. -
The Miocene Period
1 Grazing herds are abundant. 2 Raccoons and wolves appear. -
The Pliocene Period
1 Large Carnivores appear. 2 Climatic cooling increased. -
The Pleistocene epoch
1 woolly mammoths appear. 2 Rhinos and humans appear. -
The Holocene Epoch
1 the last glacial period ends. 2 Complex human societies develop. -
The Anthropocene Period
1 Nuclear tests. 2 domesticated chickens.
