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Huronian
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休仑统
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详细解释：
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以下为句子列表：
英文: 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.
中文: 休伦冰期的相关研究不如其后两次原生代冰期详尽，但从当时位于赤道附近的部份陆地也受冰层覆盖的情况看来，它似乎也是一场全球性事件。
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英文: The first of these glacial periods is often called the Huronian glaciation because it is well exposed in rocks just north of Lake Huron in southern Canada.
中文: 第一次冰期称为「休伦冰期」，因其遗迹在加拿大南部休伦湖北方的岩石中清晰可见。
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英文: 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.
中文: 这些层次分明的岩种，暗示著休伦冰期恰好发生于大气中的氧气浓度初升之际。
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