查询词典 cretaceous

6 The 3rd-order sequence have been identified in early Cretaceous, the position of sequence is erected on 2 sets andesite.

3将下白垩统划分为6个三级层序，指出本区两层安山岩的层序位置。

The andesite lava (114Ma) and quartz porphyry (94Ma) are of Early Cretaceous age.

安山岩（114Ma）和石英斑岩（94Ma）则是早白垩世火山活动的结果。

The Late Jurassic-Early Cretaceous activity produced basaltic and basaltic andesitic lavas(146Ma,137Ma), followed by gabbro intrusion(135Ma) and aplite dyke (129Ma).

侏罗纪末～早白垩世初的火山活动除有熔岩（146Ma，137Ma）喷出外，还发育有辉长岩侵入体（135Ma）和辉绿岩岩墙（129Ma）等次火山岩。

Based on properties of the rock attached to some of the fragments, Arbour and her colleagues think the specimen may date to about 70 million years ago in the Upper Cretaceous Period.

基于附着在骨骼上碎石的特性，阿伯尔和她的同学们认为这一物种生活在0.7亿年前白垩纪早期。

Through statistical analysis of the rock mechanic properties of upper Jurassic and Cretaceous red mudstones, siltstones and sandstones in the middle Sichuan Red Basin, the range of their compressive strength, the features of the shearing strength and of the deformation curves are proposed in this paper.

文摘：对川中白垩系、侏罗系的泥岩、砂岩、泥质粉砂岩的抗压强度进行统计分析，得出红层岩石作为地基时抗压强度的范围值供设计参考，对泥岩、砂岩的其他力学性质进行了评价。

The biostratigraphy of Cretaceous/Tertiary boundary sections from eight localities is summarized and compared in order to define a continuous or complete section.

本文总结了八个地区白垩纪—第三纪界线的生物地层资料，试图确定一个完整的连续剖面。

Based on the study of biostratigraphy and anoxic eventstratigraphy, we propose that the Qingshankou Formation may correspond to the oceanic anoxic event at the CenomanianTuronian boundary in the Cretaceous, and the age of the Qingshankou Formation in the Songliao Basin is the Late Cenomanian to the Early Turonian.

结合生物地层研究成果，认为青山口阶下部曾发生过古湖泊缺氧事件，其层位大体可与白垩纪古海洋CenomanianTuronian界线事件层进行对比，由此提出了松辽盆地青山口阶下部的时代归属于晚白垩世Cenomanian晚期-Turonian早期的新观点。

It is very clear that their different opinions are mainly caused by their different understanding of the nature, components and international correlation of the Jehol Biota, as well as the criteria of the Jurassic-Cretaceous boundary.

非常明显，产生不同观点的主要原因是我国专家对于热河生物群的性质、特征、组成和国际对比，以及侏罗－白垩系界线的定义和标准各自有着不同的认识和理解。

It indicates a regional tectonicprocess. The boundary extinction is mainly influenced by sea level changes in southernTibet. The regression occurred from late Campanian of Cretaceous to early Danian ofPaleogene.

西藏南部晚白垩世的海平面从坎潘晚期到丹尼早期是逐渐降低的，生物消亡特点显示出与海平面变化的一致性，可能原因主要受海平面变化的影响。

The term is used at various localities in North Africa, includes beds ranging from carboniferous to Early Cretaceous

在北非不同的地方使用这个名称，包括从石炭纪到早白垩纪的地层。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。