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silurian造句
31. The clastic rock reservoirs of Upper Devonian and Silurian and the carbonate reservoirs of Middle and Lower Ordovician are mainly distributed in the pen- dine area around central Tarim basin. 32. The Middle Silurian stratabound uranium deposits in Western Qinling were formed due to hydrothermal modification of ground water and reconcentration of uranium from the sedimentary source rocks. 33. The Middle Ordovician Llandovery rugose corals are abundant in the Yangtze region, especially in the Early Silurian. 34. The contact relationship between Silurian and Devonian is parallel unconformity. 35. There are also resemblances among Early Silurian rugose coral faunas of the Yangtze region, eastern Australia, and eastern North America to some extent. 36. Porphyry mineralization, occurred in the Silurian Period, finally formed ore bodies.