Huronian

常见例句

This hematite is gray, however, because the grain size is larger.) The layering of these distinct rock types indicates that the Huronian glaciations occurred precisely when atmospheric oxygen levels first rose.
這些層次分明的巖種，暗示著休倫冰期恰好發生於大氣中的氧氣濃度初陞之際。
Like the better-studied late Proterozoic glaciations, the Huronian event appears to have been global, based on interpretations that some of the continents were near the equator at the time ice covered them.
休倫冰期的相關研究不如其後兩次原生代冰期詳盡，但從儅時位於赤道附近的部份陸地也受冰層覆蓋的情況看來，它似乎也是一場全球性事件。
Huronian System
休侖系
Upper Huronian
安尼米基系