When these ground formations meet up with the ceiling formations, the result is a "column.
地面上的石笋与顶上的钟乳石相接在一起时就成了“石柱”。
The stratigraphic column in this district includes all the Paleozoic formations.
这个地区的地层柱包括全部古生代岩系。
Sometimes stalactites and stalagmites grow so that they meet and form a column. Many caves are filled with strangely shaped rock formations that were built in this way.
有时，石钟乳和石笋不断长大，它们相会而形成石柱。许多洞穴中长满了这样堆积而成的奇形怪状的石头。
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