The reefisland belt from Tusuo Lake to Huashixia is mainly composed of massive reef limestone and bioclastic limestone.
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;
2
The eastern reefisland area, with shallow seawater, is higher parts of Xisha apophysis, where the basement is directly covered with reef facies carbonate rocks.