2) The composition and rock type of the algal limestone are complex, the main rock types include lettuce-like stromatolites, algal reef, digitate stromatolies, wave-like stromatolites and so on;

• 该区藻灰岩岩石组成及类型复杂，主要的藻灰岩岩石类型有包心菜状叠层石、藻礁、指状叠层石、水平波状叠层石等；