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...V semster zoology geological time scale era period epoch million organisms evolved years coenozoic quaternary holocene dominance of man domestication animals and agriculture modern genera species last ice age thousand ago woolly mammoth extinct pleistocene mass extinction huge floods many large mammals mastodons prehistoric cave paintings tertiary pliocene dry climate oceans shrink increase specialization mountains rise first hominids appear orchids miocene like apes evolution monkeys horse elephant radiation grazing grasslands all grass subfamilies distinct oligocene archaic attain their maximum diversity creodonts carnivores origin eocene forests monocotyledons flowering plants ancestors camel bats paleocene warm vegetation abounds most insectivores abundant grasses rhododendrons whales rodents mesozoic cretaceous tetrapod families himalayas andes alps arise dinosaurs ammonites marsupials placental pantotheres cool angiosperms radiate jurassic bird archaeopteryx earliest dicotyledons...