The Pennsylvanian conodont genus Neognathodus from southern Guizhou, South China: evolution and its stratigraphic significance
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Abstract:
Early to Middle Pennsylvanian conodonts from the Naqing section in Luodian, Guizhou, South China are well-documented. Based on several conodont genera from deep-water facies, their successions are applied as the standard conodont zonation from China for global correlation. Meanwhile, Neognathodus, a shallow-water genus that is rare in slope facies in South China, is of great importance in stratigraphic correlations especially in shallow-water facies in North America, East Europe, and North China. In this report, with reference to the standard zonation, successions of Neognathodus from three sections of slope facies (Naqing, Narao, and Luokun) in Luodian are studied and discussed. Furthermore, based mainly on the platform symmetry of the P1 elements, an evolutionary trend divided into five stages is preliminarily introduced. The resurgence of symmetric elements of this genus in Stage 4 (e.g., N. bothrops, N. colombiensis, and N. nataliae) is suggested as an auxiliary index for the base of the global Moscovian Stage.
