БИОСТРАТИГРАФИЯ КОНОДОНТОВ ФОРМАЦИИ МУНГОГ (НИЖНИЙ ОРДОВИК), ОБЛАСТЬ ЕНГВОЛЬ (ЮЖНАЯ КОРЕЯ)

Abstract

Three sections (Golmacha, Seonghwangchon, and Mohari sections) of the Mungog Formation, Yeongweol, are examined for conodont biostratigraphy. Assemblage Zone 1 (= Semiacontiodus nogamii - Cordylodus lindstroem -Utahconus beimadaoensis Zone), Assemblage Zone 2 (= Rossodus manitouensis - Chosonodina herfurthi Zone), Assemblage Zone 3 (=Scolopodus quadraplicatus-Paroistodus proteus - Drepanoistodus forceps Zone), and Assemblage Zone 4 (= Paracordylodus gracilis Zone are tentatively established within the formation. The preliminary data on correlation of these zones are briefly summarized. The Cambrian - Ordovician boundary in the Yeongweol area is probably present within beds immediately below Assemblage Zone 1, near the base of the Mungog Formation.