the Silurian的用法和樣例：
例句
- Ancient plant in the early Paleozoic marine mainly to the late Silurian Period, the original plants begin boarding land.
古植物在古生代早期以海生藻類(lèi)為主，至志留紀末期，原始植物開(kāi)始登上陸地。 - The contact relationship between Silurian and Devonian is parallel unconformity.
泥盆系與志留系之間為平行不整合接觸。 - It is concluded that the source supply of Silurian asphalt sandstone is mainly from Middle and Lower Cambrian.
通過(guò)烴源巖及構造演化史研究認為，塔中志留系瀝青砂巖的油源主要為中一下寒武統。
