Age-class structures

glacial age(ice-age)

middle age and old age people

rock-forming age and ore-forming age

SHRIMP U-Pb zircon age and whole rock Rb-Sr isochrone age

(40)Ar-(39)Ar age

(40)Ar-(39)Ar age dating

~(14)C age

~(39)Ar~-~(40)Ar isotopic age

~(40)Ar preserved age

~(40)Ar-~(39)Ar age

~(40)Ar~(-39)Ar age spectrum

“Post Marinoan” ice age

14C age

14C age dating

39Ar-40Ar plateau age

40Ar- 39Ar age of muscovite

40Ar- 39Ar isochron age

40Ar preserved age

40Ar-39 Ar age