由岩石，尤其是水成岩组成的地层。
它们是水成岩，是由海水作用沉至海底的。
They are sedimentary rocks, rocks which were laid down by the action of water on the bed of the ocean.
诸如砂岩这样的水成岩同样表明：昔日更短。
Sedimentary rocks such as sandstone also testify to the quicker days of yore.
该丘经历了早期海底、海水潜流带、混合水和大气淡水成岩环境。
This sponge mound has experienced the early submarine, Marine phreatic water, mixed water and meteoric freshwater environments.
水成岩墙的存在对油气和其它成矿溶液的运移和储集具有重要意义。
The existence of neptunian dikes is of great significance in the migration and accumulation of oil and gas, and other diagenetic fluids.
一种十分常见的水成岩叫油页岩，他是一种很软的岩石，很明显是因为被压积在海底而后形成的。
A very common sedimentary rock is called shale, which is a soft rock and was obviously formed by being deposited on the sea bed.
一种十分常见的水成岩叫油页岩，他是一种很软的岩石，很明显是因为被压积在海底而后形成的。
A very common sedimentary rock is called shale which is a soft rock and was obviously formed by being deposited on the sea bed.
一种十分常见的水成岩叫油页岩，他是一种很软的岩石，很明显是因为被压积在海底而后形成的。
A very common sedimentary rock is called shale which is a soft rock and was obviously formed by being deposited on the sea bed.
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