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|Title:||Two Frasnian/Famennian boundary sections in Vietnam|
|Authors:||Ta, Hoa Phuong|
|Keywords:||Conodont fossils;Linguiformis Zone;Triangularis Zone;Frasnian;Famennian|
|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 (D 3‐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 (D3xn). 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.|
|Appears in Collections:||Earth and Environmental Studies|
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