Stromatoporoid sponges were very abundant during the middle Palaeozoic Era and are thought to disappear at the end of th......

首次发现西藏安多县东巧地区晚侏罗世生物礁，造礁生物以层孔虫和六射珊瑚为主，其中，层孔虫可分为枝状，筒状和块状三种类型，它们多以原地......