这是晚奥陶世晚期大规模海退的结果。
This was the result from the large-scale regression in the Late Ordovician.
本文提出了宜昌奥陶系沉积相是台地相—台地边缘相—浅海盆地相的多相台棚式的组合类型，指出奥陶系经历了四次海进到海退的沉积旋回过程。
In this paper, it is suggested that the Ordovician sedimentary facies in the Yichang region are a combination type consisting of platform facies, platform margin facies and shallow sea basin facies.
我们通过一架望远镜观察了停留在岩架上的一只海鹦：它在张望，思索，忽进忽退。
Through a telescope we watched the unfolding drama of a puffin on a ledge, peering over the edge, thinking better of it, retreating, advancing, retreating.
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