漂砾 Glacial erratic
（重定向自Erratic block）
漂砾（erratic）是和周边石料相比形状和材质截然不同的天然石块，小则数厘米，大可达数米甚至数十米。其成因是冰川的活动，故又称冰川漂砾（英语：glacial erratic）。冰川的搬运能力相当强，一些漂砾甚至被搬运到千百公里之外。加拿大阿尔伯塔奥克托克斯的巨型漂砾，重达1.5万吨。
Erratic block
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英语百科
Glacial erratic 漂砾
（重定向自Erratic block）
A glacial erratic is a piece of rock that differs from the size and type of rock native to the area in which it rests. "Erratics" take their name from the Latin word errare, and are carried by glacial ice, often over distances of hundreds of kilometres. Erratics can range in size from pebbles to large boulders such as Big Rock (15,000 tonnes or 17,000 short tons) in Alberta.
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