The research shows that the extension of isolines of coal metamorphism or coal rank intersects the syncline axis trace at a high angle;
研究结果表明，煤变质指标等值线延展方向与向斜轴不平行而呈大角度相交；
The bottom of rocks at syncline axis is tensioned and inverse cuneiform-like rock masses are formed. By contraries, cuneiform-like rock masses are formed at anticline axis under compression.
向斜轴部的岩层底面受张拉破碎为‘倒楔形’岩块，背斜轴部岩层底面受压破碎为‘正楔形’岩块。
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