Definition of "isochron" []

• A line on a chart linking rock of the same age (especially as measured using the ratios of lead isotopes) (noun)

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• "A 40Ar-39Ar step-heating experiment on the same granodiorite yielded an irregular plateau with an age of 119±9 ka and isochron and inverse isochron ages of 148±50 and 146±35 ka."
• "The most direct means for calculating the Earth's age is a Pb/Pb isochron age, derived from samples of the Earth and meteorites."
• "With Mishra's factory, you could throw this on that isochron sceptor on the first turn and have some fun. you'd need to wait a turn or two tho. darn."