Caught In Time

*Note: This site has been created for college credit and should not be relied upon for accurate and reliable information. Thank you for your understanding.

 

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The Geologic Time Scale

Era	Period	Epoch	Age (yrs)	Life Forms
Cenozoic	Quaternary	Holocene	10.000	modern life forms
		Pleistocene	2 M (million)	LAST ICE AGE , large terrestrial mammals, mammoths, mastodons, first modern man, cave paintings
	Tertiary	Pliocene	7 M	first Australopithecines, toolmaking, Neanderthals
		Miocene	25 M	large sharks, whales, first hominids
		Oligocene	40 M	first grasses, anthropoids
		Eocene	55 M	first marine & large terrestrial mammals
		Paleocene	64 M	many kinds of mammals
Mesozoic	Cretaceous		137 M	AGE OF DINOSAURS, mollusks, dinosaurs, first primates, flowering plants,
	Jurassic		195 M	first belemnites, squids, frogs, birds, salamanders
	Triassic		225 M	first turtles, cycads, lizards, dinosaurs, mammals
Paleozoic	Permian		280 M	first mammal-like reptiles
	Carboniferous	Pennsylvanian	325 M	COAL AGE , first conifers
		Mississippian	345 M	first reptiles, spiders
	Devonian		395 M	AGE OF FISH , first insects, ammonites, jawless fish, placoderms, amphibians
	Silurian		440 M	first land plants, ferns, lycopods, sharks, boney fish
	Ordovician		500 M	first corals, starfish, sea urchins, blastoids, eurypterids, bryozoa, scaphopods, vertebrates
	Cambrian		570 M	first trilobites, conodonts, forams, sponges, worms, brachiopods, nautiloids, chitons, clams, snails, monoplacophorans, crustacea, crinoids, cystoids, carpoids
Archaeozoic	Precambrian		>570 M	first simple plants and invertebrate animals: algae, bacteria, jellyfish