“二迭系”用英语怎么说？

隧道主要通过三迭系、二迭系 紫红色 软质砂岩、泥岩岩层.It passes mainly through the purple -- color soft sandrock and mudstone in Triassic or Dyas Systems.准噶尔盆地西北缘五八区二迭系佳木河组是含火山岩系地层,即火山岩和碎屑岩混积地层.Jiamuhe formation along the northwestern margin of t...