... Lower Ordovician Series 下奥陶统 Lower Ordovician 早奥陶世 Lower Pennsylvanian 早宾夕伐尼亚世 ...
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早奥陶世地层 Early Ordovician strata
早奥陶世末期 the end of early Ordovician
晚奥陶世-早志留亚纪 Late Ordovician-Early Silurian
纸房地区具有早奥陶世海相火山岩存在。
Marine volcanics of Early Ordovician was found in Zhifang region.
于白云岩夹灰岩之层段发现大量的头足类化石，其时代属早奥陶世。
A lot cephalopoda fossils were found in the section of dolomite with limestone, which belong to early Ordovician.
河南省华北型寒武纪—早奥陶世地层可分为7个组、21个生物带、10个阶。
The North China type Cambrian and Early Ordovician strata can be subdivided into 7 Formations, 21 biozones and 10 stages.
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