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。
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。
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。
Granitic gneiss is the most extensive geologic unit in the Sulu ultra-high pressure metamorphic belt and the age of protoliths of granitic gneiss is Neoproterozoic era.
花岗质片麻岩是苏鲁超高压变质带中分布最为广泛的岩石单元，其岩石形成于新元古代。
An era of geologic time, from the end of the Precambrian to the beginning of the Mesozoic, or from about 570 to about 225 million years ago.
古生代是地质时期的一个时代，从前寒武纪末开始，到中生代初，大约从5.7亿年前到2.25亿年前。
Of, belonging to, or being the geologic time, system of rocks, and sedimentary deposits of the sixth period of the Paleozoic Era, characterized by the development of coal-bearing rock formations.
盆地周围为前震旦纪变质岩系及古生代灰岩、页岩组成的高丘、低山。
Of, belonging to, or being the geologic time, system of rocks, and sedimentary deposits of the sixth period of the Paleozoic Era, characterized by the development of coal-bearing rock formations.
盆地周围为前震旦纪变质岩系及古生代灰岩、页岩组成的高丘、低山。
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