lower Ordovician series的用法和樣例：
例句
- The Lower Ordovician organic reefs were first identified in Huanghuachang of the eastern Yangtze Gorge by the authors.
首次發現峽東下奧陶統生物礁。 - Shimen Hunan realgar deposit controlled by both dolomite of lower Cambrian Luoshanguao Group, lower Ordovician limestone and fault.
湖南石門雄黃礦床受寒武系下統婁山關群白雲岩和下奧陶統灰岩以及斷裂構造的雙重控制。
