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The Yongwol Group (Cambrian-Ordovician) redefined: a proposal for the stratigraphic nomenclature of the Choson Supergroup

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Abstract

The Yongwol Group is newly defined to comprise exclusively the Cambrian-Ordovician strata distributed in Yongwol area and replaces the Yongwol-type Choson Supergroup. It consists of the Sambangsan, Machari, Wagok, Mungok and Yonghung formations in ascending order. The Yongwol Group is bounded to the east by the Kaktong thrust, to the north by the Sangri thrust, and to the northwest by the Chonggok-Yonbongjong thrust. On the other hand, the southwestern extent of the group is obscure, as the Tanyang-Chechon area is represented by metasedimentary sequence of complex stratigraphy and contrasting lithologic successions. Based on the trilobite and conodont fossils, the Yongwol Group ranges in age from the middle Middle Cambrian to the early Late Ordovician. Other Cambrian-Ordovician sequences in the Taebaeksan region are accordingly renamed or redefined: i.e., Taebaek, Yongtan, Pyongchang, and Mungyong groups which replace the Tuwibong-type, Chongson-type Pyongchang-type, and Mungyong-type Choson supergroups, respectively. The Taebaek Group is further subdivided into the Chiktong and Sangdong subgroups.

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  1. Department of Geological Sciences, Seoul National University, 151-742, Seoul, Korea

    Duck K. Choi

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In this paper Korean geographic and stratigraphic names are spelt throughout following the current system recommended by the Republic of Korea. Korean names are arranged alphabetically and their old counterparts are also given in Appendix I.

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Choi, D.K. The Yongwol Group (Cambrian-Ordovician) redefined: a proposal for the stratigraphic nomenclature of the Choson Supergroup. Geosci J 2, 220–234 (1998). https://doi.org/10.1007/BF02910166

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