belonging to six genera: Callograptus curvithecalis, Callograptus sinicus, Aspidograptus lotolatzensis, Dendrograptus suni,Dictyonema uniforme, Adelograptus cf. tenellus, and Psigraptus jacksoni. Two graptolite zones with three subzones arerecognized ...
belonging to six genera: Callograptus curvithecalis, Callograptus sinicus, Aspidograptus lotolatzensis, Dendrograptus suni,Dictyonema uniforme, Adelograptus cf. tenellus, and Psigraptus jacksoni. Two graptolite zones with three subzones arerecognized in the eight sections of the Mungok Formation. The Adelograptus Zone is correlated with (1) La 1b of theLancefield Formation of Victoria, Australia, (2) the Zone of the Yehli Formation of Jilin,China, and (3) the Adelograptus Zone of the Road River Formation of Yukon, Canada. It suggests that the upper part ofthe Mungok Formation corresponds to early Late Tremadocian of Early Ordovician.......... graptolite, biostratigraphy, Ordovician, Mungok Formation, Yeongwol