Combining with volcanic activities, Eocene hypabyssal rocks, tonalite, intruded in Cretaceous volcanic strata.
伴随着火山活动，始新世英云闪长岩侵入白垩系火山岩地层。
Though it is roughly recognizable for the outlines of regional structure and volcanic rocks, the images of steep dip strata and boundary of volcanic rock are smeared.
虽然区域构造与火山岩的复合发育区的基本轮廓可被识别，但陡倾角地层的反射成像不清晰，火山岩地层边界模糊。
Much attention is paid to petrologic recognition marks and distribution regulation of volcanic event strata in coal bearing sequences of Taiyuan formation in the middle of North China.
研究了华北中部太原组含煤地层中火山事件层的岩石学识别标志和分布规律。
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