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Wikipedia definition
1. MaastrichtianThe Maastrichtian is, in the ICS' geologic timescale, the latest age or upper stage of the Late Cretaceous epoch or Upper Cretaceous series, the Cretaceous period or system, and of the Mesozoic era or erathem. It spanned from 70.6 ± 0.6 Ma to 65.5 ± 0.3 Ma (million years ago). The Maastrichtian was preceded by the Campanian and succeeded by the Danian.
Read “Maastrichtian” on English Wikipedia
Read “マストリヒシアン” on Japanese Wikipedia
Read “Maastrichtian” on DBpedia

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