Early Tremadoc Graptolites Taxonomy and Biozonation in Central Hunan, China

doi:10.19657/j.geoscience.1000-8527.2021.078

Abstract

Abstract:

The Nanba (Yiyang, Hunan Province) is one of the most complete areas of Tremadocian in China. According to the graptolite specimens from the lower Tremadocian in the study section and the contemporaneous paleontological and stratigraphic data at home and abroad, all graptolites in the study section were measured and statistically identified. Three genera and four species of graptolites were identified, including: Rhabdinopora flabelliforme parabola (Bulman, 1954), Adelograptus tenellus (Linnarsson, 1871), Adelograptus altus Willims & Stevens, 1991, and Ancoragraptus bulmani (Spjeldnaes, 1963), and mainly described and discussed two zone fossils, Rhabdinopora flabelliforme parabola (Bulman, 1954) and Adelograptus tenellus (Linnarsson, 1871). Based on the study of phylogeny, the Rhabdinopora flabelliforme parabola biozone and Adelograptus tenellus biozone were identified from the Yinzhubu Formation, in which, the Rhabdinopora flabelliforme parabola biozone is the lowest Ordovician strata there. Based on the key fossil in the graptolites’ zone, the Rhabdinopora flabelliforme parabola biozone is accurately compared with the coeval domestic and foreign strata.

Key words: taxonomy, biozonation, graptolite, Tremadoc, central Hunan

CLC Number:

DENG Liting, LI Ming, YANG Zhenjing, HUANG Mo. Early Tremadoc Graptolites Taxonomy and Biozonation in Central Hunan, China[J]. Geoscience, 2021, 35(05): 1354-1362.

Figures/Tables 5

Fig.1 Section location map (a) and traffic location map of Shuikou Village (Yiyang, Hunan Province, South China) (b)[11, 19]

Fig.2 Biostratigraphic and litho-stratigraphic records of graptolites(modified from Li Ming et al.[11],thick horizontal line denoting graptolite species strata, and blue vertical line denoting extension of graptolite in the strata)

Fig.3 Lower Ordovician graptolites from Yiyang (Hunan)

Table 1 Correlation chart for Tremadoc graptolite biozones in China (after refs.[2-3,12,14,16,28,30,33,38-40,47-48,50])

Table 2 Correlation chart forthe study section with Tremadoc graptolite biozones in the world (after refs.[15,29,33,49-51])

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