轮南异1井中生代地层划分及其化石依据

THE MESOZOIC STRIATIGRAPHIC DIVISION FROM THE WELL LUNNAN NO. 1 AND ITS FOSSIL EVIDENCES

轮南异1井中生代地层富含孢粉、鲎虫、叶肢介和介形类等化石，证实该井存在着下三叠统和中—上三叠统。下侏罗统的阳霞组和上侏罗统—下白垩统的卡普沙良群。三叠系与侏罗系的分界应位于井深4665m处。

The Mesozoic strata of well Lunnan No. 1 contained abundant fossils such as sporo—pollen, ostracods, triops and conchostracans and so on. These fossils proved that the lower triassic, the middle and upper triassic strata, Yangxia Formation of lower Jurassic, Kapushaliang group of upper Jurassic and lower cretaceous were developed in the area of the well According to the sporo—pollen fossils, thelimit between Triassic and Jurassic strata may be divided at depth of 4 665m.