The Ordovician, Silurian and Devonian time scales

Details The Ordovician, Silurian and Devonian time scales The Ordovician, Silurian and Devonian time scales

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..51....1m&link_type=abstract

Earth and Planetary Science Letters, Volume 51, Issue 1, p. 1-8.

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6

Scientific paper

A reassessment of published Ordovician, Silurian and Devonian isotopic age determinations available has necessitated the correction of several calculated dates and revision of several stratigraphic conclusions in the light of later work. The revised dates plot close to a single time scale line, except for Rb-Sr dates on acid volcanic rocks. We conclude that the base of the Devonian is at 410 Ma, the base of the Silurian at 437 Ma, and the base of the Ordovician (Tremadoc Series) at 519 Ma. These dates are within the range of previously published dates for the base of the three periods. We place more reliance on our estimates for the Upper Ordovician, Silurian and Devonian than for the Lower Ordovician. A comparison with other time scales shows that our new scale is similar to many previously published, except for those which rely heavily on acid volcanics.

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