tertiary period
tert
ˈtɜ:ʃ
tēsh
ia
ry
ri
ri
pe
piə
piē
riod
rɪəd
riēd
British pronunciation
/tˈɜːʃjəɹɪ pˈiəɹɪəd/

Definition & Meaning of "tertiary period"in English

The Tertiary period
01

a division of earth's geological time that began about 66 million years ago and lasted until about 2.6 million years ago

example
Examples
The Tertiary Period saw the diversification of mammals after the extinction of the dinosaurs.
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