白垩纪的

Late Cretaceous and Cenozoic History of North American Vegetation.

详细描述了北美洲大陆晚白垩纪和新生代的植物群。

Velociraptors lived about 70 million years ago at the end of the Cretaceous period.

迅猛龙生活在大约7000万年前的白垩纪晚期。

Fish thought to have been extinct since the Cretaceous Period but found in 1938 off the coast of Africa .

被认为是白垩纪时期现以灭绝的鱼，直到1938年在远离非洲海岸发现。

This story, though, raises the question of why there is but a single ejecta layer of iridium and shocked quartz in late Cretaceous rocks around the world.

然而，这却引发了一个问题：为什么全世界只有一个白垩纪后期的铱和受震石英熔岩层。

Genus of herbivorous dinosaurs flourishing during the Cretaceous in South America.

在南美洲于白垩纪兴起的一种食草恐龙。

The prints are believed to have been made during theCretaceousperiod 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。

According to structural analysis and sediment comparison ,we judge the western of the basin is outside of west-edge thrust nappe belt .

盆地现今的西界为西缘逆冲推覆带所限，而西缘逆冲推覆带主要形成于晚侏罗世一白垩纪。

The project will make full use of Cretaceous marine, terrestrial strata and paleontological records.

项目将充分利用中国大陆发育完好的白垩纪海相、陆相地层及古生物记录，通过松辽盆地白垩系科学钻探全岩芯取样和多学科综合研究的途径，着眼于厘定反映地质事件和气候变化的层位及标志和时间格架，解决高分辨率海、陆相沉积事件的精确对比，分析地层记录中气候标志和古生物类群的地理分布，集中研究陆地和海洋环境对同一事件的响应机制，重溯白垩纪地球表层系统重大地质事件过程及成因，探究陆相烃源岩大规模形成、陆地生物群更替与温室气候变化和碳循环之间的正/负反馈关系和机制等科学问题，为预测全球长时间尺度上的气候变化趋势提供科学依据。

A number of geological and mineral composition and geochemical investigations indicate that the deep geodynamics process and mantle characteristics of middle Jurassic gabbros suits from south Jiangxi province are distinguish from Cretaceous gabbros suits from coastal belt of Fijian province, the former are related to mantle upwelling and lithosphere extension, the later are related to subduction and lie on back-arc basin in tectonic environment.

对赣南车步辉长岩类的地质特征、矿物学和地球化学特征进行了研究，着重讨论它与沿海辉长岩类构造环境和源区性质的不同，研究表明它可能是中国东南部中侏罗世软流圈上涌、岩石圈伸展和地壳裂解的产物，而沿海白垩纪辉长岩类的构造环境是弧后拉张盆地；车步辉长岩类的源区可能是未受到明显俯冲组分影响的富集地幔，而沿海白垩纪辉长岩类的源区可能包含较多俯冲组分。

In truth, agreement on the cause of the mass extinction at the end of the Cretaceous (when not only the dinosaurs, but also a host of other species died) has never been as cut and dried among palaeontologists as it may have appeared to the public.

事实上，对白垩纪末期发生大规模灭绝的原因，似乎大众比较认同，但在古生物学家中，它从未形成最终定论。在白垩纪，灭绝的不仅仅只有恐龙，还有许多其它物种。

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。