青海果洛、玉树地区二叠纪和三叠纪复理石相遗迹化石

本文系统描述了产自我国青海南部巴彦喀拉山脉玛沁、甘德、玛多等地二叠-三叠纪(主要是三叠纪)复理石相的遗迹化石。主要遗迹属如:Paleodictyon,(古网迹),Protopaleodictyon(原始古网迹),Megagrapton(巨画迹),Helminthoida(蠕形迹),Helminthopsis(拟蠕形迹),Helicolithus(螺旋迹)Lophoctenium(冠梳迹)清楚地证明为深海Nereits遗迹相典型代表,也是迄今为止该遗迹相在我国发现最丰富的地区。遗迹化石产地玛沁、玛多深海相位于我国两个板块之间的对接带附近,说明遗迹化石同古构造的关系。

PERMIAN--TRIASSIC FLYSCH TRACE FOSSILS FROM THE GUOLUO AND YUSHU REGIONS,QINGHAI

The flysch trace fossils described in this paper including 15 ichnogenera and 20 ichnospecies,Were collected from the Permian--Triassic strata in the Guoluo and Yushu regions, southern Qinghai, thses two places have been most abundant in trace fossils of Nereites facies in China up to now.All trace fossils are well-preserved,and with quite abundant varieties. Among them, the Pascichnia and Agrichnia are predominant with a few Fodinichnia, but common shallow Domichnia and Cubichnia are absent, so it's proved that these trace fossils developed in turbidites of deep-sea slope environments. The fossil sites are just located on the Maxin-Xiugou conve-rgent joint zone in Guoluo and near the crustal consumption zone between the Tanggula Plate and Bay an kela Plate, of Yushu.The following fossils are described in this paper,such as,Chondrites, Impona}glphus,Helicolithus,Helminthopsis, Hel- minthoida, Nereites, Neonereites, Lophoctenum, Megagrapton, Paleodictyon, Protop-alondictyon, Phycosiphon, Plaaolites, Spirophycus and Sublorenzinia.