Abstract The Haikou Formation of Middle Devonian in Luquan contains coal bearing sediments (predominantly clastic rocks)which are of littoral origin and yield abundant fishes, fossil plants and pelecypods.

• 云南禄劝中泥盆世海口组为以碎屑岩为主的滨海相含煤沉积，地层中产有丰富的鱼类、植物和双壳类化石；