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tertiary
The Tertiary geological time interval covers roughly the time span between the emise of the non-avian dinosaurs and beginning of the most recent Ice Age, approximately 65 million to 1.8 million years ago.
Trivia about tertiary
Giovanni Arduino classified rocks oldest to newest as primary, secondary & this, a term still used
AskOxford.com tells us that this word is the missing one in the sequence primary, secondary... quaternary