| 1 | According to the conodont and fusulinid fossils, their ages are determined to be Devonian -Permian. | |
| 2 | The third period of the Paleozoic era, the Silurian follows the Ordovician period and precedes the Devonian. | |
| 3 | During the Devonian period, insects began to exploit terrestrial environments. Flight, the exoskeleton, and metamorphosis are probably keys to insect success. | |
| 4 | Silurian -Devonian island-arc volcanic formation may be hosted in rock full of porphyry copper deposits. | |
| 5 | Laminated siliceous rocks in country rocks might represent the nature of the Devonian hydrothermal sedimentary rocks. |
Copyright © Purple Culture Co., Ltd. 2001 - 2026. All right reserved.
