Peat is the first stage of coal formation.

泥炭是煤炭形成的第一阶段。

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Through analysis on coal formation and system, expound the change regulation of Boli coal field.

通过对含煤建造及构造体系的分析，探讨了勃利煤田的变质规律。

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Coal formation strata is one of the basic geological condition for occurrence and form of Mingshui spring group.

煤系地层是明水泉群形成和存在的基本地质条件之一。

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They are encouraging drillers to use tainted coal mine water to hydraulically fracture gas wells in the Marcellus Shale formation, with the twin goals of diverting pollution from streams and rivers that now run orange with mine drainage and reducing the drillers' reliance on fresh sources of water.

WSJ: Pa. pushes drillers to frack with coal mine water