Carboniferous: of, belonging to, or denoting a geologic division of the Paleozoic Era following the Devonian and preceding the Permian.

石炭纪的，石炭系的：(属于或表示)地质上的一个分段，即紧跟着泥盆纪而早于二叠纪的古生代的。

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Hence it is considered that a galactic year can be based on to institute an ideal geologic time scale in which a galactic year is an era.

银河年是建立理想地质年代表的基础，每一个银河年就是一个代。

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These geologic formations date to the Mesozoic era, when layers of sedimentary limestone accumulated under water.

这些地质形成日期中生代时期，当层沉积的石灰岩积累下的水。

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