Age of the Transition in the Pre-Cambrian Atmosphere

Details Age of the Transition in the Pre-Cambrian Atmosphere Age of the Transition in the Pre-Cambrian Atmosphere

Feb 1965

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965natur.205..586c&link_type=abstract

Nature, Volume 205, Issue 4971, pp. 586 (1965).

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RECENTLY published age determinations1,2 together with other figures3 from British Guiana can be used to give more information about the Pre-Cambrian atmosphere. Rutten4 has suggested that a tentative age of 1,000 million years for the oldest geological `red beds' indicates a provisional minimum age for the present oxygenic atmosphere. He further suggests that the transition between the latter and an earlier anoxygenic atmosphere occurred between 2,000 and 1,000 m.y. ago. Older `red beds' occur in British Guiana and it is postulated here that the above transition was probably between 3,000 and 2,500 m.y. ago.

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