是一种生物礁灰岩彩石。
西汉水群出露于盆地的南部，以板岩、千枚岩及砂岩为主，夹灰岩块和生物礁；
The Xihanshui Group, which distributes in the southern of the basin, is mainly slates, phyllites and sandstones with carbonatite and reef blocks.
托索湖—花石峡礁带的主体由块状的礁相灰岩和生物碎屑灰岩所组成；
The reef island belt from Tusuo Lake to Huashixia is mainly composed of massive reef limestone and bioclastic limestone.
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