Words similar to oligocene

Example sentences for: oligocene

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A complex scenario for the origin and diversification of Artemisia and Seriphidium , and subsequent parallel evolution of the two genera in the Old and New Worlds, was proposed by Ling [ 39 49 ] . The putative common ancestor to both "sister genera" was hypothesized to have existed in northern Asia, based on reported fossil pollen records that date the taxa to the early Oligocene or lower Eocene of the lower Tertiary, with speciation accompanied by migrations during the Tertiary and Quaternary periods - forced southward by the advancing polar ice sheets.
Graham [ 73 ] suggested that the most convincing earliest fossil pollen records for Artemisia are late Oligocene from Central Europe.