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http://www.fossilmuseum.net/GeologicalHistory.htm

Geologic Time is divided and subdivided into various categories as presented here:
Eons are divided into Eras; Eras are divided Periods; Periods and subperiods are divided into Epochs
(Epochal subdivisions referred to as "ages" are not given in the chart)

Phanerozoic EON (544 mya to present) "The age of visible life"	ERA	Periods		EPOCH	Evolutionary Milstones
	Cenozoic Era (65 mya to today)	Quaternary (1.8 mya to today)		Holocene (11,000 years to today)	Modern man radiates, "science" appears and eventually computers and the Internet become ubiquitous.
				Pleistocene (1.8 mya to 11,000 yrs)	Neandertals appear and disappear; Homo erectus and Homo sapiens appear
		Tertiary (65 to 1.8 mya)		Pliocene (5 to 1.8 mya)	Ape-like ancestors of modern humans (Hominids), the australopithecines
				Miocene (23 to 5 mya)	Grazing horses, antelopes appear
				Oligocene (38 to 23 mya)	Radiation of more modern animals: most modern bird forms have appeared; most modern mammals have appeared.
				Eocene (54 to 37 mya)	First grasses appear, a resource for herbovores; trees thrive. Some modern mammals appear: advanced primates; camels, cats, dogs, horses & rodents
				Paleocene (65 to 54 mya)	Flowering plants begin radiation extending through the Eocene. Small mammals radiate
	Mesozoic Era  (245 to 65 mya)	Cretaceous (146 to 65 mya)		Divided as: Upper; Middle; Lower	Major extinction includes dinosaurs and ammonites (K-T) Appearances include: flowering plants (angiosperms); lizards; placental animals (early mammals); snakes; social insects; marsupial and primitive placental animals Modern insect forms radiate
		Jurassic (208 to 146 mya)			Appearances include birds; crabs; frogs and salamanders Dinosaurs radiate to dominate the land
		Triassic (245 to 208 mya)			Breakup of Pangaea begins Major extinction event: tabulate corals and conodonts disappear - ammonoids, reptiles and amphibians decimated Appearances include: dinosaurs; crocodiles; marine reptiles; turtles;Pterosauria and mammals Major groups of seed plants appear
	Paleozoic Era  (544 to 245 mya)	Permian (286 to 245 mya)			Major extinction of invertebrates (P-T). Trilobites fade away forever. All but articulate crinoids dissapear Seedplants producing large trees
		Carboniferous (360 to 286 mya)	Pennsylvanian (325 to 286 mya)		Conifers & many winged insects appear
			Mississippian (360 to 325 mya)		Reptiles appear. Trilobites become scarce
		Devonian (410 to 360 mya)			Mass extinction (F-F) Land colonized by plants and animals Appearances include: insects; sharks; amphibians (tetrapods); lung fishes and earliest seed plants. Extensive radiation of fishes.
		Silurian (440 to 410 mya)			Jawed fish, cartilaginous fish and vascular plants appear. Primitive terrestrial predators: Arachnids.
		Ordovician (500 to 440 mya)			Mass extinction First land plants; bryozoans appear. Trilobites begin to specialize.
		Cambrian(544 to 500 mya)	Tommotian (530 to 527 mya)		Appearance of hard parts and vision - fossils become common. Appearances include: vertebrates; jawless fish; small shelly animals; conodonts; trilobites radiate repeatedly and reach their peak diversity.	First major radiation of animals
Precambrian Time (4,500 to 544 mya) "deep time on earth"	Proterozoic Era  (2500 to 544 mya)	Vendian (650 to 544 mya) or Ediacaran		No Epochs	Cold climate with glaciation in late Proterozoic
		Neoproterozoic (900 to 544 mya) - Late			Rodinia supercontinent splits (.75 ba) forming Panthalassic Ocean
		Mesoproterozoic (1600 to 900 mya) - Middle			Rodinia supercontinent forms (1.1 ba)
		Paleoproterozoic (2500 to 1600 mya) - Early			.
	Archaean  (3800 to 2500 mya)				Toxic atmosphere of ammonia methane and other gases Formation of stromatolites
	Hadean  (4500 to 3800 mya)				Earth's environment extremely hostile to life as we know it. Oldest rocks form (3.8 ba) Sun forms and planets coalesce
Dawn of Time (13,700 mya)	The Big Bang (13,700 mya)