isochron

/ ˈaɪsəʊˌkrɒn /

noun

a line on an isotope ratio diagram denoting a suite of rock or mineral samples all formed at the same time. The slope of the line is related to the age of the rock or mineral suite
a line or curve on a geological map or cross section (esp of oceanic crust) connecting points of identical age

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Hartmann, W. K. Martian cratering 8: isochron refinement and the chronology of Mars.

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