名词
中文翻译：石灰岩层
同义词：
['limestone', 'limestone layer', 'limestone bed例句：1. The calc-tufa formations are a geological wonder.（石灰岩层是地质奇观。）']
例句：
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1. The calc-tufa formations are a geological wonder.
石灰岩层是地质奇观。
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2. The limestone layer is rich in minerals that can be used for building materials.
石灰岩层富含可用于建筑材料的矿物。
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3. The limestone layer was formed millions of years ago during the Carboniferous period.
石灰岩层在数百万年前，即石炭纪时期形成。