TAILIEUCHUNG - Báo cáo " Two Frasnian/Famennian boundary sections in Vietnam "

Conodont fossils belonging to Frasnian/Famennian (F/F) boundary interval have been discovered within several geologic sections in Vietnam, including Ngoc Lam, Xom Nha (Quang Binh), Kang Ka Pass, Nguom Kim Pass (Cao Bang), Noong De Pass (Nghe An), and Si Phai Pass, Ma Pi Len Pass (Ha Giang). However, the F/F boundary with both the linguiformis and triangularis conodont zones that bracket the boundary has only been identified at Si Phai Pass and Xom Nha Mountain. At Si Phai Pass, F/F boundary within the Dong Van ‐ Nho Que Section has been identified . | VNU Journal of Science Earth Sciences 23 2007 187-193 Two Frasnian Famennian boundary sections in Vietnam Ta Hoa Phuong College of Science VNU Received 02 July 2007 Abstract. Conodont fossils belonging to Frasnian Famennian F F boundary interval have been discovered within several geologic sections in Vietnam including Ngoc Lam Xom Nha Quang Binh Kang Ka Pass Nguom Kim Pass Cao Bang Noong De Pass Nghe An and Si Phai Pass Ma Pi Len Pass Ha Giang . However the F F boundary with both the linguiformis and triangularis conodont zones that bracket the boundary has only been identified at Si Phai Pass and Xom Nha Mountain. At Si Phai Pass F F boundary within the Dong Van - Nho Que Section has been identified between beds S12 8 and S12 9 within the lower part of Toc Tat Formation D3-C1 tt . This part of the section is composed of thin bedded stripped and colorful limestone interbedded with pure thin and average bedded grey and pink - grey limestone. Exposure of F F boundary is best observed in a cave mouth within Xom Nha Mountain. All four major F F boundary conodont zones rhenana linguiformis triangularis and crepida have been found in a grey and dark-grey average to thick bedded limestone and clayey limestone sequence that belongs to the Xom Nha Formation D3 xn . Here the F F boundary has been determined to lie between beds 9-3b and 9-4a within bed 9 in the Xom Nha Section. Keywords Conodont fossils Linguiformis Zone Triangularis Zone Frasnian Famennian. 1. Introduction Typical for all stratigraphic boundaries at present fairly broad paleontological criteria have been used to define the F F chronostratigraphic boundary. For each such boundary there is a specific fossil lineage within a broader group of fossils that has the most important role in defining the boundary level. The concept of a Global Boundary Stratotype Section and Point GSSP is now used as the stratotype for each chronostratigraphic boundary defining each increment of geologic Tel. 84-4-8544423. E-mail .

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