Cretaceous [kri'teiʃəs]

Cretaceous的基本解释

n.

白垩纪, 白垩系

adj.

白垩的, 白垩纪的

相似词

cretaceous

与Cretaceous相关的网络例句 [注：此内容来源于网络，仅供参考]

Dawsonite of Mesozoic strata in Northeast China and adjacent area distribute in Lower Cretaceous strata from Hailaer basin,Tamtsag basin, Erlian basin, Kailu basin and Fuxin basin, and Upper part of Lower Cretaceous and Lower part of Upper Cretaceous from southern Songliao basin.

东北及邻区中生代地层中的片钠铝石分布于海拉尔盆地、塔木察格盆地、二连盆地、开鲁盆地和阜新盆地的早白垩世地层及松辽盆地南部的早白垩世晚期-晚白垩世早期地层中。

The Lower/Upper Cretaceous boundary in Songliao Basin is,therefore,between the Quantou and Denglouku formations,instead of between the Quantou and Qingshankou formations.2.The dark mudstones and shales in the Member 1 of Qingshankou Formation are of high organic carbon and low diasteranes contents.Organic geochemical characters are illustrated by biomarkers of 28,30-bisnorhopane and gammacerane,and positive excursion of kerogen isotopes.It is suggested that the dark mudstones and shales in the Member 1 of Qingshankou Formation are the products of lake anoxic period.It corresponds to the oceanic anoxic event at Cenomanian-Turonian boundary in Cretaceous.3.Based on the study of biostratigraphy,chronostratigraphy,magnetostratigraphy and event stratigraphy,a correlation of the lacustrine sequence to marine standard has been proposed,i.e.,the Quantou Formation corresponds to Cenomanian stage,Qingshankou Formation correlates to Later Cenomanian-Early Turonian,Yaojia Formation to Later Turonian-Coniacian,Nenjiang Formation to Santonian-Campanian.Sifangtai and Minshui Formations to Maastrichtian. 4.Analysis of lithology,lithofacies and microfossils of Cretaceous in Songliao Basin, shows that shore and shallow lake facies yield the most abundant microfossil groups,and the predelta and deltaic distributary plain facies rich in fossils as well.In the shore and shallow lake areas during the high level periods(such as Qingshankou and Nenjiang sedimentary periods),the lacustrine biota are of high diversity and high abundance.

因此，松辽盆地上、下白垩统的界线应在泉头组的底界，即泉头组与登娄库组之间，而不是泉头组的顶界。2、青山口组一段黑色泥岩、页岩具有有机碳含量高、重排甾烷含量低，生物标志物出现28，30—双降藿烷和伽马蜡烷，干酷根碳同位素具有正向偏移等有机地球化学特征，表征为青山口组一段黑色页岩、油页岩是古湖泊缺氧事件的产物，它对应于白垩纪古海洋Cenomanian—Turonian期界线附近缺氧事件，二者具同步性。3、通过生物地层学、年代地层学、磁性地层学和事件地层学研究，认为泉头阶大体相当于Cenomanian阶，青山口阶相当于晚Cenomanian—早Turonian阶，姚家阶对应于晚Turonian—Coniacian阶，嫩江阶对应于Santonian—Campanian阶，四方台阶和明水阶相当于Maastrichtian阶。4、通过对松辽盆地上白垩统的岩性、岩相及微体化石分析，认为滨浅湖相是微体生物群最为发育的相带，其次为三角洲前缘相和三角洲分流平原相。

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。

与Cretaceous相关的网络解释 [注：此内容来源于网络，仅供参考]

Cretaceous：白垩纪

本帖最后由 hcchm 於 2010-4-11 09:21 PM 编辑 白垩纪(Cretaceous)界於侏罗纪和古近纪之间. 而当美国洛杉矶加大(UCLA)最近发表研究报告指出,食物不仅能防治心脏病和癌症,均衡的饮食及运动还能保健大脑,有助学习成效,其中鲑鱼、核桃及奇异

Cretaceous：白垩的

cresylic 甲酚的 | cretaceous 白垩的 | Cretan 克里特岛人

Cretaceous：白堊纪(系)

白堊 chalk | 白堊纪(系) Cretaceous | 白堊凝灰岩 chalk tuff

Cretaceous：白垩纪的

cretaceous 白垩纪 | cretaceous 白垩纪的 | cretaceous 白垩系

Cretaceous period：白垩纪

由老到新依次为:三叠纪(Triassic Period)该纪地层在德国南部研究最早,地层具明显三分性,"Tri-"即"三"的意思;侏罗纪(Jurassic Period)在法国与瑞士交界的侏罗山最早研究了该纪的地层;白垩纪(Cretaceous Period)英吉利海峡北岸,这一时代的地层中产出白色细粒的碳酸钙,