Both clay and sandstone are unstable rock formations.

黏土和砂岩都是不坚固的岩石构造。

《柯林斯英汉双解大词典》

Rock formations play an important role in the design of a Chinese-style garden.

石头在中式园林的设计中发挥着重要的作用。

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This is to give you a pressed-in feeling, in order to later produce unexpected joy when you turn around the hall to see the amazing rock formations and a big lake.

这是为了给你一种紧张的感觉，以便稍后当你转过大厅看到惊艳的石头和一个大湖时产生意想不到的喜悦。

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He reported about the huge rock formations and said there was no way to reach the valley below.

VOA: special.2009.01.07

These parks include huge colored rock formations, rivers,waterfalls,beautiful trees, other plants and many different kinds of wild animals.

VOA: special.2009.04.15

Still, there are similarities. Lake Champlain has wildlife and rock formations that are similar to or even the same as the Great Lakes.

VOA: special.2009.01.05

He loves this place, its rock formations and the choppy sea that changes by the hour.

BBC: Travelling solo in the world��s most romantic country

The coastline here is best known for its gorges and eroded limestone rock formations that protrude offshore.

BBC: A road trip toward holiday nirvana

The Stone Forest, a set of towering rock formations, truly looked like a work of art.

WSJ: Tess Gerritsen on Taking Her Mother's Ashes to China | Traveler's Tale