The uranium deposit of Silurian age in a certain area is controlled mainly by fracture and morphologically changing parts of uranium bearing siliceous limestone and chert beds.
某地区志留系中的铀矿床，主要受硅灰岩和硅岩含矿层形态变异部位和断裂构造控制。
Straddling the late Ordovician period and the early Silurian period, the Andean-Saharan ice age was marked by a mass extinction, the second most severe in Earth's history.
Andean - Saharan冰河期横跨了Ordovician冰河期的后期和Silurian冰河期的前期，大灭绝成为了其标志性事件，那是地球历史上第二个气候最恶劣的时期。
The authigenic illite ages of the Silurian bituminous sandstone reservoirs in the Yingmaili area are consistent with the general characteristics of the age distribution within the basin.
英买力地区志留系沥青砂岩的自生伊利石年龄符合盆地内的整体分布规律。
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