Geosciences Journal

The Association of Korean Geoscience Societies (한국지질과학협의회)
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The Yongwol Group (Cambrian-Ordovician) redefined: a proposal for the stratigraphic nomenclature of the Choson Supergroup

Choi, Duck-K.

  • Published : 1998.12.31

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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 trilobited 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.

Keywords

References

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