黔中三叠纪牙形类生物地层研究的新进展

New Advances in the Biostratigraphy of Triassic Conodonts in Central Guizhou

本文是对黔中平坝、安顺早—中三叠世新近发现的牙形类生物地层初步研究成果的报导。在该区首次对大冶组、安顺组、青岩组及边阳组内建立了9个牙形类带或组合带。因该区地处华南三叠系相变的台地边缘带,其研究成果对于贵州乃至国内外三叠纪地层的进一步划分和对比,以及沉积相和古生态的探讨,都很有意义。

The Lower-Middle Triassic Conodonts from central Guizhou Province, with 9.Con-odonts zones or assemblages have been reported and the descending order of the Conodonts zones as follows: Bianyang Formation: 9. Neogondonlella of. excelsa Zone Qingyan Formation: 8. Neogondonlella constricta Zone Anshun Formation: 7. Neospathodus timorensis Zone 6. Neospathodus triangularis and Neospathodus homeri Assemblages 5. Neospathodus waageri and Neospathodus cf. waageri Assemblages 4. Parachirognathus Zone Daye Formation: 3. Neospathodus cristagalli Zone 2. Neospathodus dieneri Zone 1. Anchignathodus parvus Zone The Conodonts sequence provides a reliable evidence for the correlation of the Lower-Middle Triassic stratigraphy of China with the strata in the world (Table 1).