the jurassic-cretaceous的意思|示意

The second and third row structure exist the middle-turn low and mature Jurassic oil-gas from Cretaceous-Jurassic floors.

第二、三排构造存在白垩系—下第三系中转侏罗系低成熟—成熟油气的特征。

In the Jurassic and Cretaceous, generally it was also the shelf sea (shallow sea), but there were lacustrine and lagoonal environments in different parts of the basin.

侏罗纪-白垩纪在总的浅海陆棚环境下，盆地不同地区也形成了湖泊和潟湖环境。

The three major rock systems of the Mesozoic era, the Triassic, Jurassic and the Cretaceous are notable oil-producing systems.

中生代的三大岩系：三叠系、侏罗系和白垩系，是三个著名的产油岩系。

Oil of Jurassic and Cretaceous stratum in South central section comes from Wuerhe hydrocarbon source rock, and belongs to the mature crude oil.

中南段侏罗系和白垩系的油属于偏腐殖型成熟原油，来自乌尔禾组烃源岩。

The actual split between the two groups, though, had happened much earlier, during the Jurassic period, and by the late Cretaceous there were many species of bird around.

尽管，这两种物种早在侏罗纪时期就已分道扬镳，而且，到了白垩纪后期，已出现了许多种的鸟类。

The volcanic type uranium deposits in East China basically occur in Jurassic and Cretaceous systems.

我国东部火山岩型铀矿床基本上都产在侏罗、白垩系中。