geologic epoch的用法和樣例：
例句
- The quaternary period of geologic time extends from the end of the tertiary period to the present.
地質時期中的第四紀是從第三紀一直到現在。 - Although magnetic reversals have occurred many times in the geologic past, it is not yet possible to predict when the next reversal will occur.
儘管在過去地質時期地磁場發生了多次倒轉，但要預測下次倒轉將在何時發生也還是不可能的。
