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- In order to discuss the regularities of the cretaceous stratum change process in Linpanshan, a lot of practical environment investigations were made. 摘要为了探讨宁夏六盘山地区白垩纪地层演化的规律，进行了实际环境的地质调查。
- The results show that the Cretaceous strata located in Sancha-Sidianwas deposited in late Cretaceous. At least, it contains late Cretaceous strata. 结果表明这一带的白垩系地层沉积于晚白垩纪 ,或至少含有晚白垩纪的沉积。
- Based on the study of the zircon SHRIMP chronology,the boundary between the Jurassic and the Cretaceous strata is located at the bottom of the sandstone in the Weimei Formation. 结合锆石SHR IM P年代学研究可以确定侏罗纪/白垩纪的界线位于前人认为的维美组上部砂岩之底。
- The controlling factors for the hydrocarbon accumulation in the Cretaceous strata in the Jiangling depression have long been one of the controversial problems. 摘要作为江陵凹陷油气勘探的领域之一，白垩系在许多关键问题上还存在分歧和争议，白垩系的成藏主控因素是争论的焦点问题之一。
- the cretaceous stratum 白垩系地层
- Sedimentary Characteristics for the Cretaceous Strata in the Northern Depression of the South Yellow Sea Basin 南黄海盆地北部坳陷白垩系沉积特征
- THE FEATURES AND SEDIMENTARY ENVIRONWENTAL ANALYSIS OF THE CRETACEOUS STRATA ON THE NORTHEAST MARGIN OF HEFEI BASIN 合肥盆地东北缘白垩纪地层特征及沉积环境分析
- The correlation of sedimentary facies and palaeogeography and ground water from the Cretaceous strata in the Ordos Basin 鄂尔多斯盆地白垩纪岩相古地理与地下水相关性探讨
- Cretaceous stratum i s the main gas producing zo ne in Kela a rea.It is important to know clearly the distribution of sand body of Cretaceous stratum in Kela area for exploitation in the future. 勘探早期，由于钻井数少、井距大，地质资料的限制,用常规方法建立的储集层砂体骨架模型很难合理地认识地下砂体的分布特征。
- 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。
- 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。
