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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。
- Generation and feature of the Cretaceous immature oil in Yanji basin. 延吉盆地白垩系未熟油的生成与特征
- 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。
- The Cretaceous is named after the large amounts of chalk (fossilized plankton) found in rocks of the period. 白垩纪以这个时代的地层主要为白垩沉积而得名。
- The Cretaceous extinction was like a terrible streak of bad luck lasting millions of years. 白垩纪的生物绝灭,犹如一场持续千百万年的可怕厄运。
- In June of 1980 Luis W.Alvarez and his cot- leagues introduced a theory for the cause of the extinction that occurred between the Cretaceous and Tertiary periods. 1980年6月,路易斯·W·阿尔瓦雷茨和他的同事们,提出了一个关于白垩纪与三叠纪交界时那次大灭绝原因的理论。
- 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.
- Corresponding to the Cretaceous global events, there are several times of anoxic events in the Songliao Basin. 松辽盆地白垩纪出现多期缺氧地质事件,它与全球白垩纪的地质事件相对应。
- Two fossil spore-pollen assemblages are found in the Cretaceous red beds of Jin Ju Basin, Chekiang Province. 浙江金衢盆地白垩系红层,共发现二个化石孢粉组合。
- The most famous case of this is the large dinosaurs that disappeared by the end of the Cretaceous," he said. 最有名的是大型恐龙在白垩纪晚期消失的例子。”
- 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
- Crabs have been found at a number of sites, such as the Cretaceous Gault clay and the Eocene London clay. 有些甲壳亚门动物寄生于鱼、其他甲壳亚门动物或甚至于脊椎动物的体内。
- 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。
- They had the longest necks of the plesiosaurs and survived from the Early Jurassic to the end of the Cretaceous. 薄板龙科生存于早侏儸纪到白垩纪末期。
- 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;
- During the Cretaceous, however, many of these blocks of land were near their current latitudinal position or higher. 不过在白垩纪期间,很多陆块已经位于现今所在的纬度附近了,有些甚至还在纬度更高之处;
- It is concluded that the new oil-gas bearing layer is located above the unconformity between the Cretaceous a... 该套地层在研究区普遍具备成藏的基本条件,应作为进一步勘探的有利目标。