Around the same time, a massive volcanic eruption in the Wrangell Mountains in Alaska occurred, blanketing the area in a layer of ash, up to a foot deep, called the White River tephra.
大致在同一时期，阿拉斯加州的弗兰格尔山脉出现了大规模的火山爆发，这个地区遂被深达一英尺的怀特河火山灰所覆盖。
Volcanic ash silted up the Columbia River 35 miles away.
火山灰淤积在哥伦比亚河中长达35英里。
The industry waste slag fly ash or the river sand is used as the siliceous material.
工业废渣粉煤灰或河砂一般被用来作为硅质材料。
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