Quaternaryria.
1. adj. Géol. Said of the second period of the Cenozoic era, spanning from two million years ago until today, characterized by the appearance of the man and the alternation of glacial and temperate periods. U t. c. s. m.
OrRTOGR. ESCR. with may. initial c. s.
2. adj. Geol. Belonging or relating to this period.
3. adj. its. Consisting of four units, numbers or elements. Was u. s. c. t. m.
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