강원도 평창군 멧둔재 일대에 분포하는 고생대층에 관한 고생물학적 연구

다국어 초록 (Multilingual Abstract)

The Paleozoic sedimentary rocks are distributed in the Metdunjae area in Pyeongchang-eup, Pyeongchang-gun, Gangwon Province. The sedimentary strata are divided, in ascending order, into the Cambrian Sambangsan Formation, Silurian Yeongheung Formation, Middle Carboniferous Yobong Formation, and Permian Mitan Formation. The Paleozoic strata in the study area is strongly disturbed, therefore, the geologic structure is very complex and, so far, no one tried to carry out the paleontologic study on these strata. The limestones of the Yeongheong Formation and the Yobong Formation contain abundant conodonts.
The purpose of this study is to investigate and describe the conodonts found from the Yeongheung Formation and Yobong Formation in the study area and to determine the geologic age of these formations.
10 form-species of 5 form-genera of conodonts are identified from the Yeongheung Fromation and 13 species of 9 genera from the Yobong Formation. The conodonts found from the Yeongheung Formation are Panderodus unicostatus, P. amplicostatus, Ozarkodina hassi, Oz. simplex, Oz. crispa, Oz. n. sp. A, Oulodus tripatus, Ou. panuarensis, Neoprioniodus planus, and Aacodus sp. According to the work of Wang and Aldridge (2010), these conodonts are reported from the Lower Silurian series of the South China. Therefore, it can be concluded that the geologic age of the Yeongheung Formation of the study area is the Lower Silurian Period.
The conodonts found from the Yobong Formation are Adetognathus lautus, Declinognathodus lateralis, D. noduliferus, Diplognathodus ellesmerensis, D. coloradoensis, Hindeodus minutus, Idiognathoides sinuatus, Idiognathodus delicatus, I. magnificus, Neognathodus bothrops, N. medexultimus, Neogondorella clarki, and Streptognathodus sp. Based on these conodonts the Neognathodus bothrops Zone can be established. This conodont zone can be correlated with the Neognathodus bothrops Zone of the upper part of the Manhang Formation in the Danyang area and with the Neognathodus bothrops - N. atokaensis Zone in Texas, United States. The conodont zone and conodont fauna of the Yobong Formation in the study area indicate the geologic age of the formation is the Atokan stage of the Middle Carboniferous Period.
The color of conodonts from the limestones of the Yeongheung Formation is gray (Color Ateration Index, CAI : 5). The CAI of the conodonts of the Yobong Formation is 5 - 7. The CAI of the conodonts is relatively high at the outcrops near the entrance of Metdunjae Tunnel toward the Mitan area. Generally, the CAI of the conodonts found from the study area is relatively high, however, the cause of the thermal alteration of the conodonts is unknown.

목차 (Table of Contents)

• Ⅰ. 서 론 1
• 1. 연구 지역 1
• 2. 연구사 2
• 3. 연구 필요성과 목적 2
• Ⅱ. 연구 방법 4
• Ⅲ. 연구결과 10
• 1. 지질개요 10
• 1) 캄브리아기 삼방산층 12
• 2) 실루리아기 영흥층 13
• 3) 중기 석탄기의 요봉층 16
• 4) 페름기 미탄층 20
• 5) 백악기 안산암 22
• 2. 코노돈트 생층서 23
• 1) 영흥층의 코노돈트 생층서 23
• 2) 요봉층의 코노돈트 생층서 24
• 3) 코노돈트의 생물상과 환경 25
• 4) 코노돈트 색변화 지수 결정 26
• Ⅳ. 화석 기재 29
• Ⅴ. 결론 36
• 참고문헌 38
• PLATE 1 42
• PLATE 2 44