fossils

Oftentimes, these fossils are not made available to science at all.

科学界常常压根接触不到这些化石。

The fossils appear to be an early form of seaweed washed up on a beach.

这些化石看上去是被海水冲上岸的一种早期的水藻。

The fossils may be a million years old.

这些化石可能有100万年了.

The fossils at Dinosaur Cove are embedded in hard sandstones.

恐龙峡谷中的化石都嵌在坚硬的砂岩中。

Different fossils have been preserved in different ways - some as moulds or casts.

不同类别的化石是以不同的方式保存下来的 ― ―有的如同模型或模压品.

Glauconite, detrital carbonate skeletal debris, marine fossils, and collophane are commonly present.

海绿石 、 碳酸盐骨骸碎屑 、 海相化石和胶磷矿普遍出现.

Tow factors are favorable for the preservation of organisms as fossils.

有两个因素对生物化石的保存是有利的.

Scientists have dated the fossils by their bone structure.

科学家根据那些化石的骨骼结构确定其年代.

The rocks themselves bear another kind of evidence -- the fossils.

岩石本身还拥有另一种证据 ― ―化石.

fossils over two million years old

两百多万年的化石

They were searching for fossils.

他们在找化石.

The geologist found many uncovered fossils in the valley.

在那山谷里,地质学家发现了许多裸露的化石.

Sedimentary rocks are thus tagged by the fossils which they contain.

沉积岩就这样以它们所含的化石作为鉴别的标记.

Animals and plants of remote antiquity turned to fossils.

远古的动植物变成了化石.

Fossils allow us to reconstruct ancient ecology.

化石可以让我们知道古时的生态环境。