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“门口山”这个地名,指的是新余县马洪公社图山村门口的山。“门口山组”一名,李英鉴等(1959)在创名时,对于地层剖面未作详细分层描述,动植物化石采集颇少,因而未能建立起一个较为确切的地层概念。本文赋予门口山组地层以新的概念,即是:不整合于上三迭统安源组含煤地层之上的,以产植物化石膜蕨型锥叶蕨Coniopterisof.hymenophylloides及瓣鳃类动物化石简单礼陵蛤Lilingella simplex为特征的一套粗粒长石石英砂岩夹粉砂岩、炭质泥岩及薄煤层的地层,上覆为白垩系(K)红色岩层与其呈不整合接触。
“Door Mountain” this place name, refers to the Mahogany commune in Xinyu County Tu Shan Village door. “Door Mountain Group” a, Li Yingjian (1959) at the time of its creation, no detailed description of stratigraphic stratification, animal and plant fossil collection is quite small, and thus failed to establish a more precise concept of the formation. In this paper, we give a new concept to the formation of the Menkoushan Formation that is: unconformity above the coal-bearing strata of the Anyuan Formation in the Upper Triassic to produce the fossils of the genus Coniopterisof.hymenophylloides and the petal gill fossils A set of coarse-grained feldspar quartz sandstone sandstone, carbonaceous mudstone and thin coal seam strata characterized by Lilingella simplex are overlain by a Cretaceous (K) red rock formation unconformably in contact with them.