白垩纪

Hylaeosaurus（Ornithischia,Thyreophora,Ankylosauria,Polacanthidae）,Early Cretaceous,4m

林龙（鸟臀目，装甲亚目，甲龙类，多刺甲龙科），白垩纪早期，体长4米。

The extinction or appearance of these Ostracoda always occurred in a short time interval, and can be correlated locally and globally, so they are of importance in bioeventstratigraphy. This article listed six such biological events in Qaidam Basin and discussed their causes. The extinction of Cetacella reflected temperature decrease at global scale and changes of palaeoclimate zones during the latest Jurassic and the earliest Cretaceous; The rapid decline of Cypridea in the earliest Cretaceous may be a result of the strikes of small planets; at the latest middle-Eocene Austrocypris became extinct, and at Oligocene Hemicyprinotus disappeared. These events related to the changes of the geological conditions at that time. The explosion of Cyprideis at the middle-Miocene was because the rise of Qinghai-Xizang Plateau which resulted in the dry climate and development of salt lakes.

这些水生生物的绝灭或发生均很迅速，在区域或全球范围内均可对比，具有生物事件地层学意义：Cetacella属的绝灭可能是侏罗、白垩纪之交全球性的古气候降温和气候带变化在柴达木盆地的反映；早白垩世之后Cypridea的迅速衰退是地外因素灾变的结果；中始新世晚期的Austrocypris的绝灭、渐新世Hemicyprinotus的绝灭都与当时地质条件的改变存在著内在的联系；中中新世Cyprideis的爆发推断是青藏高原隆升，导致气候乾燥、湖水咸化的结果；而晚更新世晚期1。

An early rift sequence is overlain by a large Late Cretaceous delta, which culminates with the mid-Campanian Rakopi Formation coal measures.

一个早期的裂谷层序上覆有一个较大的晚白垩纪三角洲，后者的顶层则是中坎佩尼阶拉科皮组煤系。

The Cretaceous—the last period when dinosaurs ruled the roost—was followed by the Palaeocene.

恐龙主宰世界的最后一个时期是白垩纪时代，之后就进入了古新代。

The basin evolution from the Cretaceous to the Palaeogene shows a complete process of rifting development, in which the Lower Cretaceous is theproduct of early rifting and the Upper Cretaceous and the Eogene represent the sediments of thermal subsidence in late rifting stage.

白垩纪—早第三纪盆地演化为一个完整的裂谷发育过程，下白垩统是裂谷早期断陷作用的产物，而上白垩统和下第三系则代表裂谷后期热沉降沉积。

Thanks to a very patient British fossil hunter, the business end of a Pliosaur, including much of the skull and jaw, has been collected from the southern shores of England. What's the big deal?

我们要非常感谢一位英国的化石探险家，他是一位专注于白垩纪时期生物的科学研究者，他在英格兰南方海岸找到了大量的巨型头盖骨和颚，是什么生物，拥有如此大的骸骨？

This research consolidated that evolutionary models using w as an indicator of selective pressure provide valuable approaches for analyzing the adaption of protein-encoding sequences. Moreover, it also indicated that Polypodiaceous ferns responded to the terrestrial ecosystem changes initiated by angiosperms through molecular adaption of functional genes such as rbeL.

这些结果一方面显示了基于ω比值检验DNA编码序列分子适应的有效性，另一方面也提示水龙骨类可借助rbcL等功能基因的适应性进化，应对白垩纪被子植物引发的陆地生态系统改变。

It is inferred that the Cretaceous rhyolitic rocks developed widely in Zhejiang Province probably originated by partial melting of the basement metamorphic rocks. Continuous underplating of basalt resulted in significant increase of introduced mantle-derived materials with time.

推测浙江省广泛发育的白垩纪流纹质火山岩可能是基底变质岩部分熔融形成，由于持续的玄武岩底侵作用，造成幔源物质的加入量显著地随时间增加。

The tyrannosaurus is one kind of large-scale sarcophagy dinosaur, the height the approximately 13 meters, the body weight the approximately 7 metric tons, survives in the Cretaceous Period last stage Masichuike step finally in 3,000,000, was the approximately 68,500,000 years to 65,500,000 years.

霸王龙是一种大型的肉食性恐龙，身长约13米，体重约7公吨，生存于白垩纪末期的马斯垂克阶最后300万年，距今约6850万年到6550万年。

Amargasaurus（Saurischia,Sauropoda,Diplodocimorpha）,Early Cretaceous,12m

阿马加龙（蜥臀目，蜥脚类，梁龙形类），白垩纪早期，体长12米。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。