geologic age

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• geologic age — geological age or geologic age, a period in the history of the earth, earlier than the postglacial, or recent, that can be dated only by geological methods …   Useful english dictionary

• Age — ([=a]j), n. [OF. aage, eage, F. [^a]ge, fr. L. aetas through a supposed LL. aetaticum. L. aetas is contracted fr. aevitas, fr. aevum lifetime, age; akin to E. aye ever. Cf. {Each}.] 1. The whole duration of a being, whether animal, vegetable, or… …   The Collaborative International Dictionary of English

• Age of a tide — Age Age ([=a]j), n. [OF. aage, eage, F. [^a]ge, fr. L. aetas through a supposed LL. aetaticum. L. aetas is contracted fr. aevitas, fr. aevum lifetime, age; akin to E. aye ever. Cf. {Each}.] 1. The whole duration of a being, whether animal,… …   The Collaborative International Dictionary of English

• age — [āj] n. [ME < OFr aage < ML * aetaticum < L aetas, contr. < aevitas, akin to aevum, age, eternity < IE base * aiw > AYE1] 1. the time that a person or a thing has existed since birth or beginning 2. usual or expected life span… …   English World dictionary

• Age — may refer to: Age (model theory), an aspect of mathematical model theory Age (journal), an international peer reviewed journal operated by Springer. The Age, a daily newspaper published in Melbourne, Australia Agé, a god Åge, a given name Aage, a …   Wikipedia

• geologic map — geologic map, a map that shows by various signs, colors, and symbols the geological features of a region, including the structure, composition, and age of the materials below the surface …   Useful english dictionary

• Geologic time scale — This clock representation shows some of the major units of geological time and definitive events of Earth history. The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga.[1] Other… …   Wikipedia

• Geologic record — The layer cake like appearance of concordant strata laid down over hundreds of thousands of years …   Wikipedia

• Age of the Earth — This article is about scientific estimates of the age of the Earth. For religious and other non scientific estimates, see Dating Creation. Earth as seen from Apollo 17 The age of the Earth is 4.54 billion years (4.54 × 109 years ± 1%) …   Wikipedia

• geologic time — the succession of eras, periods, and epochs as considered in historical geology. [1860 65] * * * Interval of time occupied by the Earth s geologic history, extending from с 3. 9 billion years ago (corresponding to the age of the oldest known… …   Universalium

• Geologic temperature record — The Geologic temperature record are changes in Earth s environment as determined from geologic evidence on multi million to billion (109) year time scales.Evidence for past temperaturesOur evidence for past temperatures comes mainly from isotopic …   Wikipedia