경상북도 봉화군 석포면 석개재 일대에 분포하는 전기 오르도비스기 두무골층에 대한 고생물학적 연구

국문 초록 (Abstract)

이 연구는 경상북도봉화군 석포면 석개재 지역에 분포하는 두무골층에서 산출된 코노돈트를 이용하여 이 층의 지질시대를 추정하는 데 있다. 이 층의 하부는 녹회색 셰일, 리본암 그리고 얇은 석회암이 협재된 실트암으로, 중부는 셰일이 협재된 청회색 석회암으로, 그리고 상부는 석회질 셰일과 석회암이 교호층으로 구성된다. 석회암표품은 32개를 채취하였으며, 이중20개의 표품에서 171개체의 코노돈트가 산출되었다. 코노돈트는 8속 12형태종과 6속 9복합요소 종으로 분류된다. 선별한 코노돈트는 Acodus deltatus, Cornuodus long-ibasis, Drepanodus arcuatus, Drepanoistodus basiovalis, Drepanoistodus inaequalis, Distacodus dumugo-lensis, Oistodus linguatus, Utahconus beimadaoensis, Oistodus muticorrugatus, Scanodus rectus, Scanodus furnishi, Scolopodus rex huolizhaiensis, Paltodus quinquecostatus, Scolopodus quadrangulatus, Paltodus detifer, Scolopodus flexilis, Teridontus nakamurai, Triangulodus dumugolensis, Variabiloconus bassleri, 그리고 Walliserodus ethingtoni이다. 두무골층은 생층서학적으로 2대로 나누어졌다. 즉, 하부와 중부은 미분류대로, 그리고 상부는 Triangulodus dumugolensis 帶를 설정하였다. Triangulodus dumugolensis 帶는 북유럽의 Prioniodus elegans 帶, 북미의 Oepikodus communis 帶, 북중국의 Scalpellodus tersus 帶에 각각 대비된다. 두무골층의 상부의 지질시대는전기 오르도비스기로유럽 지역의 중기 Arenig통에, 그리고북아메리카지역의 Canad조에 각각 대비된다.

다국어 초록 (Multilingual Abstract)

This study is to clarify the geologic age of the Dumugol Formation in the Seckgaejae area on the basis of the conodont fauna. The Dumugol formation is composed of greenish shale, ribbon rock and siltstone containing thin limestone in the lower part, of bluish limestone with minor interbeds of shale in the middle part, and of calcareous shale intercalated with limestone in the upper part. For conodont study, 32 limestone samples were collected from four measured sections, and 171 identifiable conodont specimens were obtained from 20 productive samples. Conodonts from the Dumugol Formation are classified into 9 multielement species referable to 6 genera, and 12 form species belonging to 8 genera. The representative specimens from the Dumugol Formation in this area are Acodus deltatus, Cornuodus longibasis, Drepanodus arcuatus, Drepanoistodus basiovalis, Drepanoistodus inaequalis, Distacodus dumugolensis, Oistodus linguatus, Utahconus beimadaoensis, Oistodus muticorrugatus, Scanodus rectus, Scanodus furnishi, Scolopodus rex huolizhaiensis, Paltodus quinquecostatus, Scolopodus quadrangulatus, Paltodus detifer, Scolopodusjlexilis, Teridontus nakamurai, Triangulodus dumugolensis, Variabiloconus bassleri, and Walliserodus ethingtoni. The Dumugol Formation is divided biostrati-graphically into two zones, viz, Unnamed Zone in tbe lower and middle part and Triangulodus dumugolensis Zone in the upper part. Triangulodus dumugolensis Zone ofthis study is correlated with those of the Scalpellodus tersus Zone of North China, Oepikodus communis Zone ofNortb America, Prioniodus elegans Zone of Baltic region. The geologic age of the upper part of the Dumugol Formation is the early Arenigian series in Europe and the Canadian stage in North America.

목차 (Table of Contents)

• 요약
• 서언
• 두무골층
• 석회암 표품 채취와 단면
• 코노돈트 화석군
• 코노돈트 대비
• 결론
• 사사
• ABSTRACT
• 참고문헌

참고문헌 (Reference)

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