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河南宜洛煤田晚石炭世太原组中的异地煤，不存在通常在煤层中见到的那种条带状－透镜状结构，而呈现出是一种粉粒状的、具有浊积层序特征的煤层．这种异地煤的底板，不是根土岩，而是含有腕足类动物化石和痕迹化石、具有海相成因的中－粗粒石英砂岩．根据煤层及其上覆、下伏岩层的沉积特征，以及与同层位的原地生成煤在空间上的展布规律，可以证明，异地煤是由于风暴回流将大量的泥炭物质携带到平均低潮面以下较深部位沉积下来的．在这种特定条件下形成的异地煤，其性质不仅仍属于煤的范畴，而且在厚度上有时也是可采的．
The exotic coal in the Late Carboniferous Taiyuan Formation of the Yili Coalfield in Henan Province does not exhibit the banded-lenticular structure commonly found in coal seams and appears to be a grainy, turbidite-ordered Seam. This off-site coal floor, not rooted rock, but contains brachiopods fossils and trace fossils, with marine origin of medium-coarse quartz sandstone. According to the sedimentary characteristics of the coal seam and its overlying and underlying strata, and the spatial distribution of coal in situ with that of the same layer, it can be proved that the ex-situ coal is due to the large amount of peat material carried by storm backflow to the average low tide The deeper part of the surface deposited below. The formation of off-site coal under such specific conditions, the nature of which is not only still belong to the category of coal, and sometimes recoverable in thickness.