白垩纪 [地质] Cretaceous ; the Cretaceous period ; Cretaceus period ; Cretaceous-Tertiary extinction event

白垩纪研究 Cretaceous Research ; CretaceousResearch ; Cretaceous

上白垩纪 chalk ; cretaceous

白垩纪海进 cretaceous transgression ; cretaceoustra gre ion

白垩纪大洋红层 CORB ; Cretaceous oceanic red beds

白垩纪时期 the Cretaceous Period ; Cretaceous ; cretaceous period million years ago

白垩纪的 cretaceous

白垩纪晚期 late Cretaceous Period ; Upper Cretaceous

白垩纪石油 cretaceous oils

白垩纪早期 Lower Cretaceous