Coal layers of Mine Liangjia in Longkou zone are Cenozoic tertiary soft rock layers, are consisted of mudstone, mudstone with oil rock, clay stone, mudstone with carbon, oil shale and coal layers.

• 摘要龙口矿区梁家煤矿煤系地层是新生代下第三系沉积的软岩地层，主要由泥岩、含油泥岩、粘土岩、炭质泥岩、油页岩和煤组成，是我国典型的三软煤系地层。