| Citation: | ZHENG Shucan，FENG Qinglai，LONG Jingjie，et al. Biostratigraphy of the Ordovician to Silurian Renheqiao Formation in the Baoshan Region, Southern Yunnan, China[J]. Bulletin of Geological Science and Technology，2025，44（4）：1-16 doi: 10.19509/j.cnki.dzkq.tb20240430
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The primary goal of this study is to establish a graptolite biostratigraphic framework for the Renheqiao Formation. To achieve this, the research focuses on the Banpo and Chadi sections in Shidian County, Baoshan City, Yunnan, which are critical outcrops for biostratigraphic analysis in the area.
A combination of high-resolution biostratigraphic and lithologic investigations was conducted to precisely define the stratigraphy and identify key biozones within the formation.
The Renheqiao Formation in the study area is approximately 71.6 meters thick, with a basal bed of about 25 cm of paleo-weathering crust. It unconformably overlies the Pupiao Formation, indicating that the study area was subaerially exposed during the Late Ordovician. Based on careful fieldwork and high-resolution surveys, a total of nine graptolite zones were identified, spanning from the upper Hirnantian in the Ordovician to the Silurian Llandovery Telychian stage. These zones are identified in ascending order as follows: the Metabolograptus persculptus Zone (R1), Akidograptus ascensus Zone (R2), Parakidograptus acuminatus Zone (R3), Cystograptus vesiculosus Zone (R4), Coronograptus cyphus Zone (R5), Demirastrites triangulatus Zone (R6), Lituigraptus convolutus Zone (R7), Stimulograptus sedgwickii Zone (R8), and Spirograptus guerichi Zone (R9).
Comparisons with the Longmaxi Formation (LM1–LM9) in the Yangtze region reveal that the nine graptolite zones of the Renheqiao Formation in the Baoshan Block correlate well with those of the Longmaxi Formation. This correlation not only strengthens the regional stratigraphic framework but also provides a solid basis for future shale gas exploration and assessment in the Baoshan Block.
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