Geosciences Journal

The Association of Korean Geoscience Societies (한국지질과학협의회)
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Graptolite biostratigraphy and its correlation of the Mungok and Yeonghung formations at Yeongwol area, Korea

Cho, Hyun-Su;Kim, Jeong-Yul

  • Published : 20070300
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Abstract

Based on graptolites from the Mungok and Yeong-hung formations at Yeongwol, Korea and recent taxonomy ongraptolites, the previous three graptolite zones are refined as theAnisograptus matanensis, Adelograptus cf. tenellus, Callograptusspp. zones, and two zones are firstly proposed for the Tremadocianrocks in the area: the Paradelograptus antiquus and Aorograptusvictoriae zones, in ascending order. The Anisograptus matanensisZone yields Anisograptus matanensis indicating an early Tremadocage. The Adelograptus cf. tenellus Zone is erected by the occurrenceof Adelograptus cf. tenellus and Psigraptus jacksoni which repre-sent lowermost Late Tremadocian in age. The Callograptus spp.Zone yielding plenty of dendroids including Callograptus and Den-drograptus, is tentative but useful to correlate with other rocks inthe Sino-Korean Block. The Paradelograptus antiquus Zone is rec-ognized by the occurrence of Paradelograptus antiquus and Clonograp-tus aureus and is correlated with the middle Late Tremadoc ofYukon, Canada. The Aorograptus victoriae Zone consists mainly ofAorograptus victoriae and subordinately of Kiaerograptus and Clonograp-tus and corresponds to the eponymous zones elsewhere. The bound-ary between the Mungok and the Yeonghung formations consistsof ribbon rock and grainstone to packstone facies of the MungokFormation and laminated dolomite, argillaceous limestone, and wack-estone to grainstone facies of the Yeonghung Formation and is drawnwithin the Aorograptus victoriae Zone which indicates middle LateTremadocian. Key words : graptolite, biostratigraphy, Ordovician, Mungok Formation,Yeonghung Formation, Yeongwol

Keywords

References

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