湘中地区有中奥陶世和早震旦世两个重要的锰碳酸盐层。

There are two important manganese carbonate horizons in the Middle Ordovician and Early Sinian strata in central Hunan Province.

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通常，它发生在基板是由石灰岩，碳酸盐岩，盐层或任何其他岩石，很容易被水侵蚀形成的溪流。

Usually, it happens when the substrate is formed by limestone, carbonate rock, salt beds or any other rock that is easily eroded by water streams.

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通常，它发生在基板是由石灰岩，碳酸盐岩，盐层或任何其他岩石，很容易被水侵蚀形成的溪流。

Usually, it happens when the substrate is formed by limestone, carbonate rock, salt beds or any other rock that is easily eroded by water streams.

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