천연기념물 칠곡 금무봉 나무고사리 화석산지에 대한 고찰 = Reconsideration of the Natural Monument Geummubong Petrified Tree Fern Fossil Site, Ghilgok, Korea

다국어 초록 (Multilingual Abstract)

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.

국문 초록 (Abstract)

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.

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