摘要
本文在陕西紫阳焕古滩原划的下志留统大贵坪组中,根据新发现的笔石,从其中又划分出下、上奥陶统及中、上志留统,其中包括奥陶纪5个笔石层和志留纪10个笔石层;在洞和群中划分出中奥陶统1个笔石层,为本区建立新的地层层序提供了可靠的证据和丰富的基础地质资料。
Based on graptolite discovered new, Upper, Middle Ordovician Epoch, containing 6 graptolitic strata, and Upper, Middle Silurian Epoch, including 8 graptolitic strata have been divided by the author from Daguiping Formation which belongs to Lower Silurian Epoch previously. So that, fundamental geological data has been provided for establishment new sequence in the region.
