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1·These animals were not as sensitive to climate changes in the Cretaceous period as they are today.

这些动物在白垩纪对气候变化不像今天这样敏感。

2·Scientists have linked the mass extinction at the end of the Cretaceous with a meteorite impact on Earth.

科学家将白垩纪末期的大灭绝与地球上的陨石撞击联系起来。

3·This change in plankton found in marine deposits is what marks the boundary between the Cretaceous and the Tertiary.

海洋沉积物中浮游生物的这种变化标志着白垩纪和第三纪的分界线。

4·Between the last layer of Cretaceous rock and the first layer of Cenozoic rock, there is often a thin layer of clay.

在最后一层白垩纪岩石和第一层新生代岩石之间，常常有一层薄薄的粘土。

5·Changes in climate before the Cretaceous period caused severe fluctuation in sea level, resulting in the extinction of the dinosaurs.

白垩纪以前的气候变化导致了海平面的剧烈波动，引发了恐龙的灭绝。

6·Fifty-seven feet long and up to nine tons, spinosaurus started poking his head around the early Cretaceous some 100 million years ago.

57英尺长，9吨重，棘龙在大约1亿年前的白垩纪早期就开始四处活动。

7·At the end of the Cretaceous, the geological record shows that these seaways retreated from the continents back into the major ocean basins.

地质记录显示，在白垩纪末期这些航道从大陆撤退，回到主要的海洋盆地。

8·Data from diverse sources, including geochemical evidence preserved in seafloor sediments, indicate that the Late Cretaceous climate was very mild.

来自不同来源的数据，包括保存在海底沉积物中的地球化学证据，都表明晚白垩世的气候非常温和。

9·Data from diverse sources, including geochemical evidence preserved in seafloor sediments, indicate that the Late Cretaceous climate was milder than today's.

来自不同来源的数据，包括存留在海底沉积物中的地球化学依据，表明晚白垩纪的气候比如今的要温和。

10·Several other mass extinctions in the geological record have been tentatively identified with large impacts, but none is so dramatic as the Cretaceous event.

地质记录中的其他几次大规模物种灭绝也被认为影响重大，但没有哪一次像白垩纪大灭绝那样夸张。

白垩纪

1·These animals were not as sensitive to climate changes in the Cretaceous period as they are today.

这些动物在白垩纪对气候变化不像今天这样敏感。

2·This change in plankton found in marine deposits is what marks the boundary between the Cretaceous and the Tertiary.

海洋沉积物中浮游生物的这种变化标志着白垩纪和第三纪的分界线。

3·Fifty-seven feet long and up to nine tons, spinosaurus started poking his head around the early Cretaceous some 100 million years ago.

57英尺长，9吨重，棘龙在大约1亿年前的白垩纪早期就开始四处活动。

4·The late Cretaceous extinction of the dinosaurs and ammonoids was just one of the more drastic in a whole series of such recurrent extinction episodes.

在这一系列周期性物种灭绝事件里，白垩纪晚期恐龙和菊石的灭绝仅仅是其中一个比较严重的事件。

5·Data from diverse sources, including geochemical evidence preserved in seafloor sediments, indicate that the Late Cretaceous climate was milder than today's.

来自不同来源的数据，包括存留在海底沉积物中的地球化学依据，表明晚白垩纪的气候比如今的要温和。

白垩的

1·Early Jurassic to early cretaceous basin group of western Liaoning is a distinguished group of fault basin.

辽西地区的早侏罗世—早白垩世盆地群是一类颇具特色的断陷盆地群。

2·Middle stage of Early Cretaceous-Late Cretaceous.

早白垩世中期—晚白垩世。

3·Analcite mineral was found from rock specimen of cretaceous system in the Ordos Basin via using micro-analysis.

通过微观分析，在鄂尔多斯盆地白垩系钻孔岩样中发现方沸石类矿物。

4·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。

5·In terms of lithology, fossil records and sedimentary facies, the Cretaceous in the Bazhou depression, Minhe basin is subdivided into Datonghe, Hekou and Minhe Formation.

民和盆地巴州拗陷的白垩系按其岩性、化石特征和沉积相自下而上分为大通河组、河口组和民和组。

(1)cretaceous period白垩纪