竹叶石为砾屑灰岩经风化与岩溶作用而形成的块石。
Bamboo stone for calcirudite by weathering and karstification and the formation of the stone.
每次冰期及间冰期沉积物中的砾石及其岩性，砾态，沉积厚度，风化程度等都有明显区别。
The gravels in deposits of different glacial epochs and interglacial stages show obviously different rock characteristics, gravel forms, deposit thicknesses and weathering degrees.
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