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。
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。
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。
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。
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。
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。
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。
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。
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。
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。
While there are a dozen or more mass extinctions in the geological record, the Cretaceous mass extinction has always intrigued paleontologists because it marks the end of the age of the dinosaurs.
虽然在地质记录中有十几次甚至更多的大灭绝，但白垩纪的大灭绝总是引起古生物学家的兴趣，因为它标志着恐龙时代的结束。
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。
Not exactly outer space then, or the Cretaceous period.
而并不是外太空或是白垩纪。
Jeholornis - this creature lived 120 million years ago in the Cretaceous.
热河鸟-这种生物活在1亿2000万年前的白垩纪。
Niedzwiedzki and Singer's discovery was reported in the journal Cretaceous Research.
尼德韦德兹克和司辛格的发现在杂志《白垩纪研究》上面发表了。
That means that our record of Balaur is restricted to the very end of the Cretaceous.
这意味着我们有关巴拉乌尔龙的记录限定于白垩纪的晚期的晚期。
An extraterrestrial impact is most closely linked to the Cretaceous extinction event.
天外来客对地球的撞击与白垩纪的物种灭绝事件有着最为密切的联系。
The Cretaceous—the last period when dinosaurs ruled the roost—was followed by the Palaeocene.
恐龙主宰世界的最后一个时期是白垩纪时代,之后就进入了古新代.
So 65 million years ago they've got very good evidence of the cretaceous exctinction event.
人们已经得到了6500万年前白垩纪灭绝事件很好的证据。
It says lice are old, predate the Cretaceous-Paleogene boundary, and must have been living on something.
它说明了虱子的历史非常久，在白垩纪-早第三纪过渡期之前，而且也肯定是寄生在某种生物上的。
One was an isolated feather dating from the Cretaceous period (about 100m years ago) that was found in Brazil.
其中一个是在巴西发现的白垩纪（约1亿年前）的一根羽毛。
They date from the early Cretaceous period, which began around 145 million years ago and ended 65 million years ago.
据悉，他们最早生活在白垩纪早期，亦即1亿4千5百万年前到6千5百万年前。
This 65.5-million-year-old layer of Earth separates fossils of the Cretaceous period from those of the Tertiary period.
这个有着6550万年历史的地层分离了白垩纪的化石和第三纪的化石。
The discovery confirms "that big birds were living alongside Cretaceous non-avian dinosaurs," lead author Darren Naish said.
这个发现对《白垩纪时期同时存在着大型鸟类和非鸟类恐龙》进行了证实。
Though the Cretaceous asteroid cleared the stage, mammals did not really get going until 10m years later, in the Eocene epoch.
尽管白垩纪时小行星撞击地球后为哺乳动物搭起了活动的舞台，但是哺乳动物真正大行其道是100万年以后的事情了，也就是在始新世时期。
The temperature drop during the Cretaceous period would almost certainly have wiped out an 'abundance' of the world's dinosaurs.
曾经称霸地球显赫一时的恐龙，在白垩纪时代的这次温度巨变中，似乎全都灭绝了。
Before the mid-Cretaceous, 100 million years ago or so, flowering plants were scarce: conifers and their relations ruled the landscape.
白垩纪中期之前，也就是说大约1亿年前，开花植物很少见：裸子植物占据着地球的景观。
Before the mid-Cretaceous, 100 million years ago or so, flowering plants were scarce: conifers and their relations ruled the landscape.
白垩纪中期之前，也就是说大约1亿年前，开花植物很少见：裸子植物占据着地球的景观。
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