Maastrichtian

Hell Creek Formation is well exposed in the badlands in the vicinity of Ft. Peck Reservoir.

Fossil of Hemipneustes leymeriei Muséum de Toulouse

The Maastrichtian (pronunciation: /mɑːˈstrɪktiən/) 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 the interval from 72.1 to 66 million years ago. The Maastrichtian was preceded by the Campanian and succeeded by the Danian (part of the Paleogene and Paleocene).

单词	Maastrichtian age
释义	Maastrichtian age 英语百科 Maastrichtian The Maastrichtian (pronunciation: /mɑːˈstrɪktiən/) 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 the interval from 72.1 to 66 million years ago. The Maastrichtian was preceded by the Campanian and succeeded by the Danian (part of the Paleogene and Paleocene).
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Maastrichtian age

Maastrichtian