Zhu et al. (1994) have reported the conodonts from the Permian Triassic boundary beds of the Dongling section at Qinshuiyan Township of Xiushui County,and the Yangou section at Rongshan Town of Leping City.The present authors have made a fresh collection from the two sections centimetre by centimetre with the discovery of many conodont specimens of Hindeodus parvus Morphotype 1 and Isarcicella staeschei ,and one of I.isarcica. The exact horizon from which Hindeodus parvus Morphotype 1 first appears could be precisely defined.The boundary beds of the Dongling section consist of clay bed (5-6cm)and Dayie Limestone; Hindeodus parvus Morphotype 1 just began to appear at the lowest horizon of the Dayie Limestone,indicating that the biostratigraphic boundary of the Permian Triassic is coincided with the lithostratigraphic boundary (between the clay bed and limestone,or between JD6 and JD7),and only 5-6cm higher than the eventostratigraphic boundary(between JD5 and JD6).The Yangou section of Leping also consists of limestone. Hindeodus parvus Zone is only 36cm in thickness,and Isarcicella isarcica Zone is first found in this section.The conodont faunas from the two sections are very simple,with no any neogondolellid elements,indicating a shallow water facies,which is quite different from the Changxing section at Meishan.Dongling section represents a typical shallow water facies at the beginning of the Triassic.
Acta Palaeontologica Sinica
P/T boundary, H.parvus Zone, I.staeschei Zone,evolutionary lineage,conodont zones,pelagic,shallow water,ostracodes,Jiangxi