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The Tertiary era, period, or formation.
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The first period of the Cenozoic era covering from 65 to 2 million years ago. It is divided into five epochs. View timeline of geologic events.
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First sub-era of the Cenozoic Era, which began about 65 Ma ago and lasted approximately 63 Ma.
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65-0.85 million years ago.
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Being of the third formation, order, or rank; third; as, a tertiary use of a word.
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Possessing some quality in the third degree; having been subjected to the substitution of three atoms or radicals; as, a tertiary alcohol, amine, or salt. Cf. Primary, and Secondary.
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Later than, or subsequent to, the Secondary.
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A member of the Third Order in any monastic system; as, the Franciscan tertiaries; the Dominican tertiaries; the Carmelite tertiaries. See Third Order, under Third.
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