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Recognition and significance of the Aurilobodus serratus Conodont Zone (Darriwilian) in lower Paleozoic sequence of the Jeongseon–Pyeongchang area, Korea

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Abstract

A total of 286 disjunct conodont elememets were recovered from 30 productive samples in 5 separate sections of the Haegmae and Hoedongri Formations, 18 m below to 36 m above the boundary between the two formations, in the Jeongseon–Pyeongchang area. Fifteen multielement and form species representing 12 genera are distinguished in the fauna of the two formations. Age-diagnostic species include Acontiodus viriosus Cui, Aurilobodus serratus Xiang and Zhang, A. simplex Xiang and Zhang, Drepanodus arcuatus Pander, Drepanodus reclinatus (Sergeeva), Drepanoistodus suberectus (Branson and Mehl), Eoplacognathus jigunsanenesis Lee and Lee, E. lindstroemi Hamar, Erraticodon tangshanensis Yang and Xu, Panderodus nogamii Lee, Parapanderodus paracornutiformis (Ethington and Clark), Plectodina onychodonta An and Xu, Scandodus choii n. sp., and Triangulodus changshanensis (Zhang). This assemblage was assigned to the Aurilobodus serratus Zone. That zone was first erected from the Middle Ordovician Machiakou Formation in the North China platform and is known also from the Duwibong Formation in Korea. These strata represent tropical, shallow marine paleobiogeographic facies. The presence of the zone on both sides of the boundary between the two formations means that the relationship between the Haengmae and Hoedongri formations is a conformity, not an unconformity, as previously thought. It is more likely that the overlying unsampled strata of the Hoedongri Formation are also Ordovician, rather than Silurian. One new species, Scandodus choii, is described here.

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  1. Department of Earth Science Education, Chonbuk National University, Jeonju, 54896, Republic of Korea

    Byung-Su Lee

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Lee, BS. Recognition and significance of the Aurilobodus serratus Conodont Zone (Darriwilian) in lower Paleozoic sequence of the Jeongseon–Pyeongchang area, Korea. Geosci J 22, 683–696 (2018). https://doi.org/10.1007/s12303-018-0032-1

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