It is these, fossilised, that form rocks such as chalk and limestone.

也正是这些物质，形成了诸如白垩和石灰石的化石。

youdao

The types of reservoir rocks mainly are oolite dolomite and dissolved porous oolite limestone.

其储集岩类型主要为鲕粒云岩和溶孔鲕粒灰岩两大类。

youdao

It mainly consists of spilite, keratophyre and volcanic clastics, intercalated with siliceous rocks, limestone and clastic rocks or lens.

主要由细碧岩、角斑岩及火山碎屑岩组成，其中有硅质岩、灰岩及碎屑岩夹层或凸镜体。

youdao

The Phoenix Cananensis palm, which is being brought in from Spain, will be placed in the centre of the roundabout, which is also being augmented with limestone rocks.

BBC: Torbay palm tree roundabout revamp 'foolish'