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Imseong Kang,Duck K. Choi 한국지질과학협의회 2007 Geosciences Journal Vol.11 No.4
The Daegi Formation in the Taebaeksan Basin of Korea is composed of shallow marine carbonate facies and has been known to yield relatively diverse invertebrate fossils of middle Cambrian age. This paper describes seventeen trilobite species belonging to fifteen genera from the Daegi Formation exposed in the Seokgaejae section, located at southeastern corner of the Taebaeksan Basin. They comprise two agnostoid species (Ammagnostus laiwuensis and Ammagnostus sp.) and fifteen polymerid taxa (Dorypyge richthofeni, Amphoton deois, Blackwelderia sp., Teinistion? sp., Palaeadotes? sp., Anomocarella temenus, ptychopariid gen. and sp. indeterminate., Changqingia deprati, Crepicephalina damia, Cyclolorenzella rotundata, Cyclolorenzella sp., Proasaphiscus sp., Manchuriella macar, Ignotogregatus manholi, and Metanomocarella tumida). The stratigraphic distribution of these trilobites provides a basis for establishment of new trilobite zones within the formation: i.e., the Crepicephalina, Amphoton, and Cyclolorenzella zones in ascending order. The Crepicephalina Zone is dominated by Crepicephalina damia, Manchuriella macar, Ignotogregatus sp. cf. I. manholi, and Ammagnostus laiwuensis. The Amphoton Zone is recognized by the restricted occurrence of Amphoton deois and dominance of Dorypyge richthofeni. The Cyclolorenzella Zone is characterized by the occurrence of Cyclolorenzella rotundata and some damesellid trilobites. These three biozones belong to middle to upper middle Cambrian in age and are closely correlated with the Crepicephalina, Amphoton, and DamesellaYabeia zones of North China, respectively.
Duck K. Choi,Sung Kwun Chough,Yi Kyun Kwon,Seung-Bae Lee,Jusun Woo,Imseong Kang,Hyun Suk Lee,Sang Min Lee,Jang Won Sohn,Young Jae Shinn,Dong-Jin Lee 한국지질과학협의회 2004 Geosciences Journal Vol.8 No.2
The Taebaek Group (Cambrian-Ordovician) in theTaebaeksan Basin comprises mixed carbonate-siliciclastic sequenceand is exposed well in the Seokgaejae section located in the central-eastern part of the Korean Peninsula. The group in the Seokgaejaesection consists of in ascending order the Myeonsan, Myobong,and Duwibong formations. This study describes in detail the well-exposed outcrop sections of the Taebaek Group in the SeokgaejaePass in order to refine the lithostratigraphy of the lower Paleozoicstrata in the Taebaeksan Basin, Korea. The refined lithostratigra-phy delineates clearly the lithologic boundary between the Myobongand Daegi formations, the Hwajeol and Dongjeom formations, theDumugol and Makgol formations, and the Makgol and Jigunsanformations. The preliminary information on trilobite faunal asem-blages suggests that the Cambrian-Ordovician boundary can beplaced within the lowermost part of the Dongjeom Formation.