Statistics for Periods of Prehistory in the Geological Column

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Supereon	Eon	Era	Period	% Correct
	Phanerozoic	Mesozoic	Jurassic	94%
	Phanerozoic	Mesozoic	Triassic	86%
	Phanerozoic	Palaeozoic	Cambrian	78%
	Phanerozoic	Mesozoic	Cretaceous	72%
	Phanerozoic	Palaeozoic	Devonian	63%
	Phanerozoic	Palaeozoic	Permian	60%
	Phanerozoic	Palaeozoic	Carboniferous	57%
	Phanerozoic	Palaeozoic	Silurian	56%
	Phanerozoic	Palaeozoic	Ordovician	53%
	Phanerozoic	Caenozoic	Quaternary	36%
	Phanerozoic	Caenozoic	Palaeogene	35%
	Phanerozoic	Caenozoic	Neogene	33%
Precambrian	Proterozoic	Neo-Proterozoic	Ediacaran	17%
Precambrian	Proterozoic	Neo-Proterozoic	Cryogenian	10%
Precambrian	Proterozoic	Neo-Proterozoic	Tonian	8%
Precambrian	Proterozoic	Palaeo-Proterozoic	Siderian	7%
Precambrian	Proterozoic	Meso-Proterozoic	Stenian	6%
Precambrian	Proterozoic	Palaeo-Proterozoic	Orosirian	5%
Precambrian	Proterozoic	Meso-Proterozoic	Ectasian	4%
Precambrian	Proterozoic	Palaeo-Proterozoic	Rhyacian	4%
Precambrian	Proterozoic	Palaeo-Proterozoic	Statherian	4%
Precambrian	Proterozoic	Meso-Proterozoic	Calymmian	3%
Precambrian	Archaean	Eoarchean	Eoarchean	2%
Precambrian	Archaean	Neoarchean	Neoarchean	2%
Precambrian	Archaean	Palaeoarchean	Palaeoarchean	2%
Precambrian	Hadean	Basin Groups	Basin Groups	1%
Precambrian	Hadean	Cryptic	Cryptic	1%
Precambrian	Hadean	Early Imbrian	Early Imbrian	1%
Precambrian	Hadean	Nectarian	Nectarian	1%
Precambrian	Archaean	Mesoarchean	Mesoarhcean	0%