cretaceous

白堊紀的地質

These fossils come from cretaceous rock layers in the desert.

這些化石來自沙漠中的白堊紀岩層。

白堊質的、含白堊的地質

The cliffs are made of soft cretaceous material that erodes easily.

這些峭壁由鬆軟的白堊質岩石構成，很容易被侵蝕。

白堊紀常大寫並加 the

Flowering plants first spread widely during the Cretaceous.

開花植物在白堊紀首次大量繁衍擴散。