Several volcanic ash beds or tuffs are known to be present in western and central North Dakota. These tuffs range in age from 70 to 20 million years and are believed to have originated from volcanoes in southcentral and western Montana and northern Wyoming.
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Despite improvements such as an Obamaera rule to strengthen monitoring and control of dust in mines, a recent report from the National Academy of Sciences says the coal mining industry needs a "fundamental shift" in the way it controls exposure to coal and rock dust in .
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