白垩纪 meaning in English
chalk
cretaceou eriod
cretaceous period
Examples
- The cretaceous extinction was like a terrible streak of bad luck lasting millions of years .
白垩纪的生物绝灭，犹如一场持续千百万年的可怕厄运。 - Only in the tropics were numerous late cretaceous groups extinguished during peaks in their evolution .
只是热带地区才有大批晚白垩纪生物类群正值其演化的极盛时期突然消亡。 - The term is used at various localities in north africa, includes beds ranging from carboniferous to early cretaceous .
在北非不同的地方使用这个名称，包括从石炭纪到早白垩纪的地层。 - 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。 - Extreme climates events in the cretaceous and paleogene
白垩纪至早第三纪的极端气候事件