白はく亜あ紀き

noun

Cretaceous period

Geological period from about 145 to 66 million years ago, following the Jurassic and preceding the Paleogene.

• 白はく亜あ紀きは恐きょう竜りゅうが繁はん栄えいした最さい後ごの時じ代だいです。

  The Cretaceous period was the last era in which dinosaurs flourished.