한국지구과학회지 (Journal of the Korean earth science society)

  • 제44권1호
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  • Pages.36-46
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  • 2023
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  • 1225-6692(pISSN)
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  • 2287-4518(eISSN)
한국지구과학회 (The Korean Earth Science Society)
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전라북도 군산시 산북동층에서 발견된 백악기 새 발자국 화석

Bird Tracks from the Cretaceous Sanbukdong Formation, Gunsan City, Jeollabuk-do, Korea

  • 정동권 (전북대학교 과학교육학과) ;
  • 김정빈 (순천대학교 물리교육과) ;
  • 조규성 (전북대학교 과학교육학부/과학교육연구소) ;
  • 김경수 (진주교육대학교 과학교육과/부설 한국지질유산연구소)
  • Dong-Gwon Jeong (Department of Science Education, Jeonbuk National University) ;
  • Cheong-Bin Kim (Department of Physics Education, Sunchon National University) ;
  • Kyu-Seong Cho (Divison of Science Education/Science Education Institutte, Jeonbuk National University) ;
  • Kyung Soo Kim (Department of Science Education/Affiliated Korea Institute of Geoheritage, Chinju National University of Education)
  • 투고 : 2023.02.14
  • 심사 : 2023.02.26
  • 발행 : 2023.02.28
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초록

본 연구에서는 전라북도 군산시 백악기 산북동층의 전석에서 발견된 소형 새 발자국 화석을 간략히 기재하고, 척추동물 발자국 화석을 포함한 산북동층 퇴적 시기를 확인하기 위해 산북동층 응회암질사암에서 쇄설성 저어콘을 분리하여 SH RIMP U-Pb법 절대연령 분석을 실시하였다. 소형 새 발자국 화석은 보존상태가 양호하지 않으나, 보행렬을 이루는 두 개의 발자국과 세 개의 개별 발자국으로 구분된다. 이들은 물갈퀴가 없고, 비대칭이며 가느다란 세 개의 발가락으로 걷는 소형 새 발자국이다. 보행렬을 이루는 발자국은 Koreanaoris dodsoni?, 개별 발자국은 Koreanaornis ichnosp.로 동정하였다. 본 연구는 산북동층 사족동물 발자국 화석 군집이 수각류, 조각류, 익룡과 새 발자국으로 구성되어 있었음을 의미한다. 절대연대 분석 결과, 산북동층 퇴적시기의 최대지질연대는 112.5±5.8 Ma로 중생대 백악기 압트절(Aptian)에 해당하며, 경상분지 진주층 하부에 대비될 수 있다. 그러므로 산북동층의 백악기 소형 물떼새 발자국 화석(Koreanaornis)은 국내에서 가장 오래된 것으로 추정된다.

In this study, small bird tracks from the Cretaceous Sanbukdong Formation in Gunsan City, South Korea, were briefly described. Detrital zircon SHRIMP U-Pb dating was conducted of the tuffaceous sandstone from the formation to determine the depositional age of the vertebrate track-bearing strata. Small bird tracks are not well-preserved but divided into two types: two consecutive tracks and three isolated tracks. They are small, asymmetric, slender, functionally-tridactyl tracks, which lack a web between digits. The consecutive and isolated tracks were identified as Koreanaornis dodsoni? and Koreanaornis ichnosp., respectively. This study adds avian tracks to the Sanbukdong tetrapod track assemblage composed of theropods, ornithopods, and pterosaur tracks. According to the U-Pb dating, the estimated age of the Sanbukdong Formation is 112.5±5.8 Ma, regard as the Aptian Stage, representing the maximum depositional age for the Sanbukdong Formation. The Sanbukdong Formation can be correlated with the lower part of the Jinju Formation in the Gyeongsang Basin. Thus, small avian tracks may represent the oldest Korean occurrence of Koreanaornis.

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