In the Late Ordovician, the lithofacies palaeogeography framework of two troughs alternating with three platformsin the Early, Middle and Late Cambrian and the Early and Middle Ordovician was changed.
In the Late Ordovician, the lithofacies palaeogeography framework of two troughs alternating with three platformsin the Early, Middle and Late Cambrian and the Early and Middle Ordovician was changed.
在中国晚奥陶世，早、中、晚寒武世和早、中奥陶世一直存在的“两槽和三台相间分布”的岩相古地理基本格局已经改变，天山北山蒙辽吉槽地中的北山槽地和蒙辽吉槽地已不再是槽地而变成了台地。