白垩纪

The Cretaceous period was a time of dinosaurs and flowering plants, marking the end of the age of reptiles.
白垩纪是恐龙和开花植物的时代，标志着爬行动物时代的结束。
Fossilized footprints from the Cretaceous reveal a diverse array of dinosaurs, including theropods and sauropods.
白垩纪的化石足迹展示了各种各样的恐龙，包括兽脚类和蜥脚类。
The Cretaceous Period saw the rise of the mighty T-Rex, a fearsome apex predator of its time.
在白垩纪，霸王龙崛起，它是那个时代令人畏惧的顶级掠食者。
The Chicxulub impact event, which occurred at the end of the Cretaceous, is believed to have caused the mass extinction of dinosaurs.
发生在白垩纪末期的奇克苏鲁布撞击事件被认为是导致恐龙大灭绝的原因。
Paleontologists have discovered numerous marine fossils from the Cretaceous, providing insights into the prehistoric ocean life.
古生物学家发现了许多白垩纪的海洋化石，为我们了解史前海洋生物提供了线索。
The Cretaceous period witnessed the diversification of birds, with some species evolving from small feathered dinosaurs.
在白垩纪，鸟类的多样性增加，一些物种从带羽毛的小型恐龙进化而来。
The Cretaceous was succeeded by the Paleogene, a period marked by the dominance of mammals and the decline of dinosaurs.
白垩纪之后是始新世，这个时期哺乳动物开始主导，恐龙逐渐衰退。
Many fascinating Cretaceous marine reptiles, like plesiosaurs and ichthyosaurs, roamed the oceans during that era.
白垩纪期间，许多迷人的海洋爬行动物，如蛇颈龙和鱼龙，在海洋中游弋。
The rich Cretaceous rock formations in many parts of the world have provided scientists with a wealth of information about Earth's history.
世界各地丰富的白垩纪岩石层为科学家提供了大量关于地球历史的信息。
The Cretaceous period, lasting from 145 to 66 million years ago, was characterized by warm climates and extensive shallow seas.
白垩纪持续了1.45亿年至6600万年，以温暖的气候和广阔的浅海特征著称。