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Updated: May 19, 2025
Phillips, for the sake of uniformity, has proposed Mesozoic, for secondary, from mesos, "middle," etc.; and Cainozoic, for tertiary, from kainos, "recent," etc.; but the terms primary, secondary, and tertiary have the claim of priority in their favour, and are of corresponding value.
The first of the above terms, Eocene, is derived from Greek eos, dawn, and Greek kainos, recent; because an extremely small proportion of the fossil shells of this period could be referred to living species, so that this era seemed to indicate the dawn of the present testaceous fauna, no living species of shells having been detected in the antecedent or Secondary rocks.
The termination of the three words is made from the Greek word Kainos, recent; while Eos signifies dawn, Meion less, and Pleion more. Thus Eocene indicates the dawn of recent species, Pliocene their increase, while Miocene, the intermediate term, means less recent.
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