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- 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。
- 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 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.
- 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;
- 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。
- A herbivorous dinosaur of the genus Triceratops, of the Cretaceous Period, having a bony plate covering the neck, a large horn above either eye, and a smaller horn on the nose. 三角龙一种白垩纪的属的食草性恐龙，有一骨质兜生在颈上，头骨上有两支大角生在眼上，中部一只较小的角生在鼻上
- Their reward: new types of sauropod (top) and pterosaur both of which lived almost a hundred million years ago, in the Cretaceous period. 他们辛苦付出的回报是新的蜥脚龙（上图）和翼龙化石，这两种动物均生活在一亿年前的白垩纪。
- The coiled, flat, chambered fossil shell of an extinct mollusk belonging to the class Cephalopoda, which was abundant in the Cretaceous period. 菊石，鹦鹉螺化石已灭绝软体动物的螺旋形、扁平的化石外壳，属头足纲动物，大量存在于中生代
- A herbivorous dinosaur of the genus Triceratops,of the Cretaceous Period,having a bony plate covering the neck,a large horn above either eye,and a smaller horn on the nose. 三角龙一种白垩纪的属的食草性恐龙，有一骨质兜生在颈上，头骨上有两支大角生在眼上，中部一只较小的角生在鼻上
- The Cretaceous period ended about 65 million years ago, a mass extinction due to impact of an asteroid at Chicxulub in Mexico wiped out the dinosaurs, except for the birds. 白垩纪期间结束了大约65百万年前,许多绝种由于小行星的冲击在Chicxulub在墨西哥消除了恐,除了鸟。
- The Cretaceous period rocks can be divided into granitic rock series and dioritic rock series in the Bailiping silver-polymetaltic ore-concentrated province. 百里坪银、多金属矿化集中区白垩纪岩浆岩主要有花岗质与闪长质两个岩石系列。
- They preyed on long-necked herbivorous dinosaurs on the Indian subcontinent during the Cretaceous Period at the end of the dinosaur age, 65 million years ago. 他们以印度次大陆的食草恐龙为食，这种食草恐龙生活6500万年前的恐龙灭绝年代白垩纪。
- Stepping down the stone stairs, people can see coal mine veins formed in the Cretaceous period, animal and plant fossils, and agates in their original forms. 游客可以在此欣赏到形成于白垩纪的地质断层、动物和植物的化石以及最原始状态的玛瑙等。
- In the perspective of an artist, he has taken advantage of such artistic forms as poetry, music, calligraphy, character-carving, and painting for the purpose of interpreting the immense as well as breathtaking arena of life in the Cretaceous Period. 从艺术家的视角，运用诗歌、音乐、书法、篆刻、绘画等艺术形式诠释了白垩纪那段浩瀚壮观的地球生命场。
