1 | The reef enriches the Carboniferous reef types. | |
2 | Volcanic eruptive activities occurred from Cambrian to Permian, most intensely in Devonian and Carboniferous . | |
3 | Carboniferous paleo-latitudes of the central Guizhou Province where bauxite distributes widely is reported. | |
4 | This eventually resulted in the oxygen-rich atmosphere of the Carboniferous period around 340 to 280 million years ago. | |
5 | The extinct trees of the genus Lepidodendron were once distributed widely and contributed largely to the coal seams of the Carboniferous . |