자원환경지질 (Economic and Environmental Geology)

  • 제57권1호
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  • Pages.93-105
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  • 2024
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  • 1225-7281(pISSN)
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  • 2288-7962(eISSN)
대한자원환경지질학회 (The Korean Society of Economic and Environmental Geology)
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천연기념물 칠곡 금무봉 나무고사리 화석산지에 대한 고찰

Reconsideration of the Natural Monument Geummubong Petrified Tree Fern Fossil Site, Ghilgok, Korea

  • 정승호 (국립문화재연구원 자연문화재연구실) ;
  • 공달용 (국립해양문화재연구소 서해문화재과)
  • Seung-Ho Jung (Natural Heritage Center, National Research Institute of Cultural Heritage) ;
  • Dal-Yong Kong (National Research Institute of Maritime Cultural Heritage)
  • 투고 : 2024.01.17
  • 심사 : 2024.02.20
  • 발행 : 2024.02.29
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초록

칠곡 금무봉 나무고사리 화석산지는 1925년 Tateiwa가 중생대 나무고사리 줄기 화석(Cyathocaulis naktongensis)을 처음 발견한 모식산지로서, 그 학술적 가치를 인정받아 일제강점기인 1930년대부터 천연기념물로 지정, 약 90여년 간 보존되어 왔다. 하지만, 발견 당시 나무고사리 화석 산출 층준을 찾지 못해, 전석 상태의 표본을 기반으로 낙동층 내 역암/사암층을 함화석층으로 해석하면서, 금무봉 일대가 광범위하게 문화재구역으로 설정되었다. 2003년 이후, 지정구역 인근 노두에서 나무고사리 화석이 발견되면서 산출지역의 퇴적암상이 특정되었으며, 나무고사리 화석의 외형과 해부학적 특징에 대한 연구가 추가적으로 이루어졌다. 이를 통해 Ogura가 국내에서 보고한 Cyathocaulis속 2종의 분류 기준을 재검토하고, C. naktongensis와 C. tateiwai가 동종일 가능성을 고찰하였다. 또한, 오랫동안 이어져 온 각종 규제에 따른 갈등과 민원 해결을 위해, 현재의 문화재 구역은 시대환경 변화에 맞게 적정성 검토를 통한 큰 폭의 재조정이 필요하다고 판단된다.

Chilgok Geummubong tree fern fossil site is the type locality where tree fern stem fossils (Cyathocaulis naktongensis) were first discovered by Tateiwa in 1925. Recognized for its academic value, it was designated as a natural monument in the 1930s during the Japanese colonial period, and preserved and managed for over 90 years. However, at the time of discovery, the stratigraphic level of tree fern fossils could not be located because the fossils were fragments detached from the rock body, and thus the Geummubong area where the conglomerate/sandstone layers of the Nakdong Formation are distributed, has been designated as a cultural heritage area. Only in the 2000s, when tree fern fossils were directly recovered from the outcrops near the designated area, the sedimentary rock facies containing the fossils were interpreted, and the anatomical characteristics of the Mesozoic tree fern fossils could be described and identified as a species level. Such studies are, in these days, redefining classification criteria done by Japanese paleontologist, Ogura. That is, Korean researchers pointed out that the classification criteria of the tree fern fossils (Cyathocaulis) reported early from Chilgok were ambiguous, and the possibility that the two species were the same species was suggested. In addition, it is necessary to reorganize designated areas as a way to resolve social conflicts and civil complaints caused by various regulations that have continued for a long time.

키워드

과제정보

이 연구를 위해 많은 도움을 준 국립문화재연구원의 김태형 박사, 나무고사리 화석 표본을 제공해 주신 동아대학교 박인석 교수, 경북대학교 고생물학연구실 및 칠곡군 관계자와 주민분들께 감사드리며, 논문의 심사과정에서 세심한 검토와 지적으로 논문의 질을 높여주신 세분의 심사위원님께 감사드린다. 이 논문은 문화재청 국립문화재연구원의 지질유산 보존관리를 위한 기초조사 및 활용 연구(NRICH-2405-A71F-1)의 일환으로 수행되었으며, 2008~2011년 실시한 「천연기념물 화석산지 모니터링조사 보고서」 의 내용 중 일부를 발췌·수정하였다.

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