查询词典 Cretaceous

The tectonic evolution of southern Junggar basin can be classified into seven stages: stage of intracontinental rift from middle Periman to late Late Carboniferous; stage of weak extension and peneplane from late Permian to early Triassic; stable depression stage in middle-late Triassic; maximal basin formation phase in the setting of weak extension in early-middle Jurassic; inactive depressed basin formation phase in thrust setting in middle-late Jurassic; stable depression stage in Cretaceous and Eogene; foreland depressed basin formation phase in thrust setting in Neocene and Quaternary.

准噶尔盆地南缘晚石炭世以来盆地构造演化可划分为七个演化阶段：晚石炭世—中二叠世陆内裂谷作用阶段；晚二叠世到早三叠世处于弱伸展-稳定坳陷作用阶段；中、晚三叠世准平原化作用阶段；早、中侏罗世为弱伸展背景下广盆形成阶段；中、晚侏罗世冲断背景下的坳陷盆地形成阶段；白垩纪到古近纪弱伸展背景下的稳定坳陷盆地形成阶段；新近纪—第四纪为冲断背景下的前陆坳陷盆地形成阶段。

The algae flourished from the Lower Permian to the Lower Cretaceous, some 140 million to 280 million years ago!!

蓬勃发展的藻类从早二叠世的早白垩世，有1.4亿至280万年前！

Based on field survey and microstructure analysis the author considered that Yiwulvshan is a Cretaceous metamorphic core complex, and pointed out the time of Yiwulvshan granite is not early Yanshanian by the comprehensive analysis of the regional structures and isotopic dating, but a late Yanshanian granite.

在此基础上，作者经过野外宏观观测和室内显微分析，基本厘定医巫闾山是一个白垩纪形成的变质核杂岩。根据区域构造演化综合分析及同位素年龄测定，认为医巫闾山花岗岩体时代并非前人所定的早燕山期，而是晚燕山期岩体。

Recently polypod ferns have been demonstrated to undergo diversifications in the Cretaceous after the rise of angiosperms. To further test this proposal, an adaptive evolutionary analysis was performed on the rbeL gene sequences of Polypodiaceous ferns under models allowing w (nonsynonymous/synonymous rate ratio) to vary among sites.

为验证蕨类植物在白垩纪适应被子植物兴起而发生分化的观点，本研究以水龙骨科附生蕨类为对象，利用位点间可变ω（非同义替换率d和同义替换率d的比值）模型对其rbcL基因的适应性进化进行分析。

A praying mantis trapped in amber that was found in Japan in January 2008 dates back 87 million years, to the late Cretaceous period.

一只被困在琥珀中的螳螂于2008年1月在日本被发现，形成的年代可以追溯到8700万年前白垩纪晚期。

Quadrupedal armored herbivore of the Jurassic and Cretaceous.

侏罗纪和白垩纪的一种四足有甲食草动物。

Amphibious quadrupedal herbivorous dinosaur with a long thin neck and whiplike tail; of the Cretaceous mostly in the southern hemisphere.

两栖类四足食草恐龙，颈长而细，鞭形尾；白垩纪主要生活在南半球。

A few radiolarian studies from this region have been published. According to available published data and our on-going investigation in the region, radiolarian-bearing strata here range from Middle Triassic or earlier to Late Cretaceous in age.

根据已发表的文献以及我们正在进行中的初步成果显示，藏南地区的含放射虫地层的时代分布为中三叠世至晚白垩世。

Small toothless saurischian dinosaurs; upper Cretaceous of Canada.

发现于加拿大上白垩纪的小的无齿蜥臀目恐龙。

Carnivorous saurischian dinosaurs with short forelimbs; Jurassic and Cretaceous.

前肢较短的蜥臀目食肉恐龙；生活于侏罗纪和白垩纪之间。

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。