Geological timescale

	Science	Theosophy
	Began (years BP)	Began (years BP)
Phanerozoic eon
Cenozoic era
Quaternary period:
Holocene epoch	11,700
Pleistocene	2,588,000	1,090,000
Tertiary period:
Pliocene	5,333,000	1,870,000
Miocene	23,030,000	3,670,000
Oligocene	33,900,000	5,280,000
Eocene	56,000,000	7,130,000
Palaeocene	66,000,000	7,870,000
Mesozoic era
Cretaceous	145,000,000	16,000,000
Jurassic	201,300,000	28,000,000
Triassic	252,170,000	44,000,000
Palaeozoic era
Permian	298,900,000	74,000,000
Carboniferous	358,900,000	110,000,000
Devonian	419,200,000	148,000,000
Silurian	443,400,000	179,000,000
Ordovician	485,400,000	214,000,000
Cambrian	541,000,000	250,000,000
Proterozoic eon	2,500,000,000	1,120,000,000
Archean eon	4,000,000,000	1,890,000,000
Hadean eon	4,600,000,000	2,170,000,000

According to theosophy, the fourth round of the earth’s evolution began about 320 million years ago, at the end of the Proterozoic. The corresponding scientific date is about 640 million years ago.

Sources:
2013 International Stratigraphic Chart, stratigraphy.org/ICSchart/ChronostratChart2013-01.pdf
H.P. Blavatsky, The Secret Doctrine, TUP, 1977 (1888), 2:68-70, 709-15
Frederick J. Dick and William Scott, ‘The age of the earth’, The Theosophical Path, April 1919, pp. 369-79
David Pratt, Geochronology: theosophy and science and Secret cycles, davidpratt.info

Problems with radiometric dating:
G. de Purucker, The Esoteric Tradition, 2nd ed., TUP, 1940, pp. 324-7 (ch. 10), 453-4 (ch. 14), 760 (ch. 25)
David Pratt, The age of earth, davidpratt.info

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Last revised: March 2013.

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Root-race chronology

Rounds and manvantaras: an outline

Evolution in the fourth round

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