白垩的

The intrusion ages range from 183.1 Ma to 99.5 Ma(except one of 715.6 Ma), most of them about 150 Ma with isochron age of 132.1 Ma, placing them in early Jurassic to Cretaceous in age.

40Ar/~(36)Ar—40K/~(36)Ar等时线图解给出的等时年龄为132.1Ma，说明这些花岗岩在形成时代上属中侏罗到早白垩世。

As the northern boundary of the North Dabie complex unit, the motion of the Xiaotian-Mozitan fault in the Early Cretaceous can be used to understand evolution of the North Dabie complex unit during doming.

晓天－磨子潭断裂是北大别杂岩带的北部边界，其早白垩世构造活动型式可以为北大别带穹隆演化过程提供制约。

And, as anyone who has studied chemistry at schoolknows, if youdrop chalk into acid it fizzes away to nothing.

并且，在学校做过化学实验的人都知道，如果你把白垩丢进酸性溶液里，它会嘶嘶作响直至溶解殆尽。

The chalk cliff rising above the city of Dover .

英国港口多佛市的白垩崖

They expected to find evidence of well-known Late Cretaceous vegetation such as conifers and cycads.

他们原本期望发现晚白垩世时期著名植物如针叶树和苏铁存在的证据。

It is these , fossilised , that form rocks such as chalk andlimestone .

也正是这些物质，形成了诸如白垩和石灰石的化石。

It is these, fossilised, that form rocks such aschalk andlimestone.

也正是这些物质，形成了诸如白垩和石灰石的化石。

The results show that: 1 the globally distributed CORBs were mainly present in late Cretaceous; 2the paleoenvironment of the CORBs is deep water of low latitude area in general; 3the lithologies are mainly consisted of red shale, red limestone, red marlstone, red mudstone and red siliciclastic shale; 4 the content of organic carbon is quite low.

通过对比，认为：1这些全球分布的大洋红层主要出现在晚白垩世，2一般分布在深水环境、低纬地区，3在岩性上，主要由红色页岩、红色灰岩、红色泥灰岩、红色泥岩、红色硅质页岩几种岩性组成，4有机碳含量普遍较低。

Marlstone samples from the Early Cretaceous Shangkuh Formation in the Jianzishan section and geological pits in Dawu＇ergen were analyzed systematically using the polarizing microscope, fluorescence microscope and freezing-heating stage.

利用偏光显微镜、荧光显微镜和冷热台对大乌尔根尖子山剖面和地质浅井早白垩世上库力组的泥灰岩样品进行了系统研究。

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。

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。