The hipparions of the Baringo Basin sequence

Details The hipparions of the Baringo Basin sequence The hipparions of the Baringo Basin sequence

Mar 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975natur.254..211h&link_type=abstract

Nature, Volume 254, Issue 5497, pp. 211-212 (1975).

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THE first appearance of Hipparion in land mammal populations of the northern hemisphere is one of the best documented biochronological events of the Neogene: the genus appeared first in the Mediterranean world about 12.5 Myr ago1. In France2 its first appearance was during the Middle-Upper `Helvetian' (ante-`Tortonian'). New radiometric information from the Far East supports an age of 10.5 Myr for the base stratotype Tortonian1. This means that the Hipparion datum of 12.5 Myr is some 2 Myr earlier than the advent of the Vallesian.

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