义马煤田义马组含煤岩系是一套典型的陆相沉积,岩性、岩相横向变化大。众所周知,在煤层底板中,直立树干化石是屡见不鲜的,但砂岩中存在有众多的直立树干化石且大部分都镜煤化实属少见。笔者在对义马组环境分析过程中注意了这一现象并对其成因和环境意义作了探讨。 Yima Coalfield Yima Formation coal-bearing rock series is a typical continental deposition, lithology, lithofacies large lateral changes. It is well-known that erect tree fossils are uncommon in the coal floor, but there are many erect tree fossils in the sandstone and most of them are rarefied. The writer paid attention to this phenomenon in the process of environmental analysis of Yimama group and discussed its causes and environmental significance.