青海柴达木盆地西南缘的石炭—二叠系过渡层及珊瑚组合序列

THE CARBONIFEROUS-PERMIAN TRANSITIONAL BED AND CORAL ASSEMBLAGES AT THE SOUTHWESTERN MARGIN OF THE QAIDAM BASIN, QINGHAI

摘要: 本文依据柴达木盆地西南缘打柴沟组所获的复体四射珊瑚化石,证实了该区有相当于黔西南“龙吟组”的地层存在。

Abstract: In the light of fossils of Tetracoralla collected from the Dacaigou Formation on the southwestern margin of the Qaidam basin, it has been verified that there exist strata equivalent to the "Longyin Formation" of southwestern Guizhou. It is proposed that the Carboniferous-Permian boundary is marked by the appearance of the Kdpingophyllidas fauna, and accordiing to the regularity of vertical distribution of its genera and species in section. three coral assemblages are established in descending order: （3） the Anfractophyllum-Nedkepingophyl- lum assemblage, （2） the Eokepingophyllum-Kepingophyllum assemblage, and （1） the Nephelophyllum-Antheria compacta assemllage. The geologic age of the Daoaigou Formation is assingned to the initial Early Permian.