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- The story takes place 6500 years ago in the late Cretaceous period. 故事发生在6500万年前的白垩纪晚期。
- From the view of stratigraphy, they all belong to the Cretaceous period. 从地层学上看，它们都属于白垩纪。
- Cretaceous Period, 145 million years ago, was the age of the dinosaurs. 白垩纪期间,145百万年前,是恐的年。
- From the view of stratigraphy, they all belong to the Cretaceous period . 从地层学上看，它们都属于白垩纪。
- Any of various large dinosaurs of the genus Iguanodon, of the Jurassic Period and Cretaceous Period. 禽龙属于侏罗纪和白垩纪的禽龙属中的任意一种大型恐龙
- During his journey the incredible diversity of life in the Early Cretaceous Period is revealed. 从它的旅程当中还可看到种种早期白垩纪的生物。
- Any of various extinct, toothed birds of the genus Ichthyornis that existed during the Cretaceous Period. 鱼鸟生存于白垩纪，现已灭绝的有牙齿的鱼鸟属动物
- The prehistoric reptile lived in the Cretaceous period, about 125 million years ago. 这只史前爬行动物生活在约一亿两千五百万年前的白垩纪。
- The prints are believed to have been made during the Cretaceous period of the Mesozoic Era, Kim said in a statement. 这些足迹被认为是在中生代白垩纪时期由当时鸟类留下的。
- This clam fossil is from the Cretaceous Period, approximately 100 million years ago. 这个蛤化石来自大约一亿年以前的白垩纪时期.
- As fossil evidences show, the fossil of taxus were found in the upper Cretaceous period. 根据化石研究表明,红豆杉科的化石发现于上白垩世。
- A large carnivorous dinosaur of the Upper Cretaceous Period of North America, characterized by small forelimbs and a large head. 霸王龙上白垩纪北美洲的一种大型食肉恐龙，前肢小且头大
- Any of various plant-eating, amphibious sauropod dinosaurs of the genus Titanosaurus, common during the Cretaceous Period especially in South America. 雷龙一种泰坦龙，食草的水陆两栖蜥脚类恐龙，在白垩纪的南美尤为常见
- Pterosaurs became extinct 65 million years ago, at the end of the Cretaceous Period. 翼龙灭绝六千五百万年前，在去年底的白垩纪时期。
- Paleoclimate in the Cretaceous period was characterized by space-time inhomogeneity. 指出白垩纪古气候具有时间上和空间上的不均匀性;
- The one regards that it belongs to Cretaceous period, and the other think that it belongs to Eogene period. 一种认为风火山群的时代应属白垩纪；另一种认为风火山群的时代应属古近纪。
- The sedimentary rocks formed in Pukou stage of Late Cretaceous period are distributed widely in the Lower Yangtze area. 摘要浦口期沉积范围遍及下扬子区。
- Any of various plant - eating,amphibious sauropod dinosaurs of the genus Titanosaurus,common during the Cretaceous Period especially in South America. 雷龙一种泰坦龙，食草的水陆两栖蜥脚类恐龙，在白垩纪的南美尤为常见
- A member of the Dromaeosauridae of dinosaurs, it was a bird-like theropod dinosaur, which flourished during the Cretaceous Period. 它属于驰龙科一员，是一种类似鸟类的兽脚亚目食肉恐龙，在白垩纪繁盛一时。
- Jurassic System entered oil-generating stage in Late Cretaceous Period, and entered oil-generating peak in Tertiary Period. 侏罗系地层在晚白垩世开始进入生油期，第三纪时进入生油高峰，这时侏罗系地层经受的最高古地温为137℃。
