As geologists mapped glacial deposits in the late nineteenth century, they became aware that there were several layers of drift, the lower ones corresponding to earlier ice ages.
19世纪晚期，在地质学家对这些冰川沉积进行定位的时候，他们意识到有好几个漂流层，位置较低的对应的是更早的冰川期。
One of a series of short scars made by glacial DRIFT on a surface of bedrock.
冰川漂流物在基岩表面留下的一系列短痕之一。
The uranium deposits are obscured by sand, peat and glacial drift.
铀矿床被砂子，泥炭和冰碛物所覆盖。
The uranium deposits are obscured by sand, peat and glacial drift.
铀矿床被砂子，泥炭和冰碛物所覆盖。
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