megayear
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megayear — (Myr or Ma) a unit of time equal to one million years … Dictionary of units of measurement
gigayear — noun A billion (10) years These syntheses gave a fresh geological, as opposed to solely geophysical, view of the up to multi megayear and near gigayear mechanism responsble for the palimpsests of a general process of change in the upper crust: a… … Wiktionary
darwin — a logarithmic unit measuring the rate of evolution in characteristics of organisms. If the measurement of a characteristic (such as length, for example) changes from a to b in y million years, then the rate of evolution is (ln b ln a)/y… … Dictionary of units of measurement
Ma — 1. see megayear 2. see Mach 3. a symbol for one million years, often used in astronomy and geology. The a stands for the Latin annum … Dictionary of units of measurement
Myr — see megayear … Dictionary of units of measurement
