查询词典 cretaceous

K-Ar whole-rock analysis of mylonites from a sinistral strike-slip ductile shear zone in the southern part of the Tan-Lu fault zone suggests that after its formation the shear zone cooled to the closure temperature 99±2 Ma ago Cat the end of the Early Cretaceous.

对郯庐断裂带南段左旋走滑韧性剪切带中糜棱岩的K-Ar全岩分析结果研究表明，该剪切带形成后，在99±2 Ma前冷却至封闭温度。

Results of the study demonstrate that arsenic in the surface soil of Chengdu basin has approximately six kinds of sources, among which sedimentary series of post-Triassic, Jurassic and Cretaceous systems along Longmen orogenic belt and acid magmatic and basic-ultrabasic rocks in the area are three main sources.

研究结果表明：成都盆地浅层土壤中砷的来源有6种，其中龙门山一带晚三叠纪、侏罗纪、白里纪沉积岩系和酸性岩浆岩及基性岩、超基性岩是成都盆地浅层土壤的主要来源。

New kinds of theropods also appeared in the Early Cretaceous period.

兽脚亚目的新种类也在白垩纪早期出现。

Dinosaur fossils produced in Nanxiong Basin, Late Cretaceous red sandstone, sandstone and siltstone in sandy.

恐龙化石产于南雄盆地的晚白垩世红色砂岩、沙质砂岩和粉砂岩中。

It may be that he swept back into the past, and fell among the blood-drinking, hairy savages of the Age of Unpolished Stone; into the abysses of the Cretaceous Sea; or among the grotesque saurians, the huge reptilian brutes of the Jurassic times.

他可能已飞进过去，掉到了旧石器时代茹毛饮血、满身长毛的野蛮人中间；掉进了白垩纪海的深渊；或者掉到了保罗纪奇形怪状的蝴锡这种巨大的爬行动物中间。

During the Early Cretaceous, southeastern Australia was both a nursery and a refugium for terrestrial vertebrates.

在早白垩纪，澳大利亚的东南为陆地脊椎动物是一和一幼儿园refugium。

In the red beds of the Mesozoic Era Nanxiong Late Cretaceous to Cenozoic Paleocene strata, the unearthed, including gastropods, ostracods insects, wheel types such as algae and dinosaur fossils were more than 60 genera, 110 species, of which the most abundant dinosaur fossils, there is Tyrannosaurus rex, short spines Nanshiungosaurus, Nanxiong Microhadrosaurus, as well as fossilized dinosaur eggs into the nest.

在南雄红层的中生代晚白垩世至新生代古新世的地层里，出土了包括腹足类、介形虫类、轮藻类和恐龙类等古生物化石共60 余属、110种，其中以恐龙化石最为丰富，有霸王龙、短棘南雄龙、南雄小鸭嘴龙以及成窝的恐龙蛋化石。

Groundwater system of Cretaceous system of Ordos basin in terms of system of water-bearing stratum of groundwater was divided and analysesed.

从地下水含水层系统的角度对鄂尔多斯盆地白垩系地下水系统进行了划分和分析。

Summing up these results, we think that the Yinmawanshan batholith came from the mixing, the fractional crystallization and the crust contamination of the enriched lithospheric mantle and the low crust magma.3、the time relationship between the Yinmawanshan batholith' formation and the tectonic extension The field observation and petrology have clearly showed that the Yinmawanshan batholith intruded in the forming period of the Liaonan metamorphic core complex, so this provided direct geological evidence to the viewpoint that the early Cretaceous magamatism of the eastern China developed in the extensionally tectonic setting.

还有一个证据来自对A型花岗岩的研究。A型花岗岩的年代学研究结果显示在东北的大兴安岭地区、张广才岭地区、本文研究区的辽东半岛，几乎所有的上述A型花岗岩都是在120-130 Ma期间形成的，与本文研究的饮马湾山I型花岗岩同时。地球化学资料还显示，这些花岗岩基本具有A1型非造山花岗岩的特点，充分反映了我国东部早白垩世的地质演化与伸展体制有关。根据上述资料我们推测，辽东半岛南部饮马湾山岩体形成时的我国东部由于受岩石圈减薄作用影响而使全区处于伸展构造体制。

In truth, agreement on the cause of the mass extinction at the end of the Cretaceous (when not only the dinosaurs, but also a host of other species died) has never been as cut and dried among palaeontologists as it may have appeared to the public.

事实上，对白垩纪末期发生大规模灭绝的原因，似乎大众比较认同，但在古生物学家中，它从未形成最终定论。在白垩纪，灭绝的不仅仅只有恐龙，还有许多其它物种。

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。