Sequence V is Miocene swamp variegated silt, mudstone interbedded by coaly shale and coal seam. The Oligocene middle grain silt probably deposited in the bottom.

• 层序V，为中新统沼泽相的杂色砂泥岩夹炭质页岩、煤层，往下可能还含有少量渐新统中细砂岩。