The Longmaxi formation of Lower Silurian is ten metres in thickness,containing three graptolite zones:Glyptograptus persculptus,Parakidograptus acuminatus and Orthograptus vosiculosus.

 
  • 下志留统龙马溪组厚10m;含Glyptograptus persculptus;Parakidograptus acuminatus及Orthograptus vosiculosus三个笔石带.
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