| 1 | The third period of the Paleozoic era, the Silurian follows the Ordovician period and precedes the Devonian. | |
| 2 | It was an important evolution and marked the end of transgression and regression cycle of the Cambrian and Ordovician in Tarim area. | |
| 3 | Therefore, the study of the lithofacies paleogeography of Majiagou Age in Ordos has important significance in both geological theory and production. | |
| 4 | In the Ordovician, Silurian Period, the Devonian, Carboniferous, the advent of low amphibians and ancient ancient reptiles. | |
| 5 | The volcanic island-arc zone is chiefly composed of intermediate-basic volcanic rocks and fine elastic rocks, which formed during the Late Cambrian-Ordovician. |
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