白垩纪

This implies a major stage of crustal growth in Proterozoic time and remelting of the crustal material in Early Jurassic time;(5) The Oligocene-Miocene adakites contain magmatic zircons that show similar Hf isotope compositions to the Cretaceous-Paleogene Gangdese batholiths, providing a key constraint that allows evaluation of the nature and timing of crustal thickening in southern Tibet owing to the India-Asia collision; and (6) As a whole, the Hf isotope information observed in zircons from the above Transhimalayan rocks demonstrates a temporal variation in εHf values, and thus TDMC ages, that suggests multiple stages of orogenic or crustal formation events.

五、渐新世、中新世的埃达克岩，其岩浆锆石的铪同位素特徵与白垩纪、古第三纪冈底斯岩浆相似，因而为藏南在印亚碰撞以后，地壳增厚的时间与机制提供了关键性的制约；六、综观上述藏南火成岩中的锆石，它们与时变化的铪同位素初始值及其对应的模式年龄记录了拉萨地块多阶段的造山与地壳形成历史。

The dominant vegetation on land in the early Cretaceous was forests of cycads, conifers, gingkgoes and ferns.

在白垩纪早期陆地上占统治地位的植被是苏铁，针叶树，银杏和蕨类。

A large carnivorous dinosaur of the Upper Cretaceous Period of North America, characterized by small forelimbs and a large head .

霸王龙上白垩纪北美洲的一种大型食肉恐龙，前肢小且头大

Any of numerous carnivorous dinosaurs of the Triassic to Cretaceous with short forelimbs that walked or ran on strong hind legs.

三叠纪至白垩纪的许多食肉恐龙，前肢短，靠其强壮的后肢走或跑。

The rare African amber also preserved bacteria, fungi, and plant remains from the Cretaceous period forest, such as this star-shaped hair from a fern species that sapped nutrients from the trees on which it grew.

罕见的非洲琥珀里还保存了来自白垩纪的细菌和植物残骸，例如这个蕨类植物的星状毛发，蕨类植物从其生长的树上获取营养物。

The trip visits Spurn Point, Holderness, Scarborough, Sewerby and Filey Brigg. Topics discussed include: erosion; the effect of geology on urban development; paleocliffs; Jurassic reefs; chalk cliffs and jet rock.

网站还提供了一些主题讨论，主题涉及到海水侵蚀、地质变化对城市发展的影响、侏罗纪时期暗礁介绍、白垩纪时期悬崖介绍及黑玉岩介绍等内容。

The fossil record of tyrannosauroid theropods is marked by a substantial temporal and morphological gap between small-bodied, Barremian taxa, and extremely large-bodied taxa from the latest Cretaceous.

据悉，雄关龙化石的年代可追溯到白垩纪中期，它可能是&缺失的一环&，能够将我们熟悉的大型霸王龙与其体型较小的祖先联系起来。

In order to deepen understanding in the MQZ at the northern continental margin of the South China Sea, this paper summarized three possible occurrences of the global MQZs originated from physical, chemical and structural processes, respectively, located at marginal zones and abyssal zones of the global oceans, mainly Jurassic MQZs both in the Atlantic and the western Pacific, Cretaceous MQZs in the northern Pacific, the Indian and in the Southern. Meanwhile, it is worth attaching importance to mantle plume activities in different scales, small magnetic sources induced by initially fragmented ridge oblique to the continental margin and faint magnetic lineations in those MQZs.

为了加深认识南海北部陆缘磁静区，归纳了全球深海和边缘两大类型磁静区的物理、化学及构造三大成因，主要包括大西洋和西太平洋侏罗纪磁静区，以及北太平洋、印度洋和南大洋白垩纪磁静区，强调磁静区与不同程度地幔柱活动、斜交扩张初始产生的小型错断磁源体及隐含弱磁条带关系的重要性。

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。

In practical study, the essential flow is""on the basis of the study of the faults, strata denuded thickness and original thickness, analyzing the controlling effect of the faults to the sedimentation and denudation, and combined with the areal geology background, reconstructing the basin prototype of each stage"". 2. As the basic theories and methods of the calculation of the denuded thickness, such as, the methods of cosmogenic nuclides, wave equation, apatite fission track, structural sections, acoustic wave, vitrinite reflection, etc, were argued detailedly , and their applicable ranges were analyzed , the denuded strata thickness of each structural layer layer of pre-Tertiary was reconstructed.

对宇宙成因核素法、波动方程法、裂变径迹分析法、构造横剖面法、声波时差法、镜质体反射率法等计算剥蚀量方法的基本原理进行充分论证、改进，分析了各方法的适用范围，在此基础上，综合充分运用上述方法，计算了济阳坳陷前第三系各构造层在不同时期的剥蚀量，绘制了中生代时期古生界顶面的地层剥蚀量等值线图、新生代时期古生界顶面的地层剥蚀量等值线图、白垩纪沉积时侏罗系剥蚀等值线图、新生代沉积期白垩系剥蚀等值线图、新生代沉积期侏罗系剥蚀等值线图等图件，并通过对古生界地层的热变质程度分析，确定了有1500～2000m的早、中三叠世的原始沉积地层在晚三叠世被剥蚀殆尽。3。

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。