单词cretaceous
adj.: 白垩纪的
n.: 【地】白垩纪[系]
网络: 白垩的；白垩系；白垩记
白垩纪的:
of the period between around 146 to 65 million years ago, when dinosaurs lived (until they died out); of the rocks formed during this time
【地质学;地理学】白垩纪[系]
石灰质的
白垩(质)的
白垩系的
Fifty-seven feet long and up to nine tons, Spinosaurus started poking his head around the early Cretaceous some 100 million years ago.
五十七英尺长、重达九吨的棘龙在早期白垩纪，大约1亿年前便行走于这个星球之上。
And when you wonder how much longer the film can go on without showing dinosaurs, T-Rex finally relents and goes back to the Cretaceous.
当你在怀疑到底还有多久才能看到恐龙的时候，霸王龙突然出现并带你回到了白垩纪时代。
Scientists believe that during the Cretaceous period, a spate of volcanic activity caused plant life to bloom on the surface of the oceans.
科学家认为，在白垩纪，一连串的火山活动导致植物在海平面生长旺盛。
During the Upper Cretaceous much of the area was covered by these sediments, they were, however, eroded to a considerable degree.
晚白垩世期间，大片区域都是被这些沉积物所覆盖，但是它们很大程度上都被侵蚀了。
By making synthetic seismic record of well data, a fine horizon calibration for the strata of Cretaceous and Jurassic are made.
利用井资料制作合成地震记录，对白垩系、侏罗系各组地层进行了精细标定；
Modern geology studies have shown that Hill is a world with a sense of typical Cretaceous rhyolitic ancient volcano - caldera.
现代地质学研究表明，雁荡山是一座具有世界意义的典型的白垩纪流纹质古火山——破火山。
A member of the Dromaeosauridae of dinosaurs, it was a bird-like theropod dinosaur, which flourished during the Cretaceous Period.
它属于驰龙科一员，是一种类似鸟类的兽脚亚目食肉恐龙，在白垩纪繁盛一时。
fish thought to have been extinct since the Cretaceous Period but found in 1938 off the coast of Africa.
被认为是白垩纪时期现以灭绝的鱼，直到1938年在远离非洲海岸发现。
Such grains have been reported in several end Cretaceous impact sites around the world as well.
这种颗粒在其他好几个白垩纪末期遗址也发现过。
The stippled area shows the distribution of a clean, permeable sandstone in the lower part of the lower cretaceous Muddy Formation.
图上画点部分为下白垩纪马迪组下部洁净，渗透的砂岩分布区域。