- Conodont Biostratigraphy of the Late Paleozoic Strata of Danyang Area, Chungbuk, Korea
- Park, Su-In ;
- Journal of the Korean earth science society, volume 20, issue 2, 1999, Pages 199~199
Abstract
The Middle Carboniferous Manhang and Geumcheon formations in Danyang area consist of sandstones, shales, and limestones. The limestones of the formations contain abundant conodonts, fusulinids, corals, crinoids, ostracods, gastropods, etc. This study was carried out to investigate conodonts of the formations systematically, to establish their detailed biostratigraphy, and to determine the geologic age of the formations in detail. Conodonts found from limestones of the Manhang Formation are Neognathodus bothrops, Hindeodus minutes, Idiognathoides opimus, I. sinuatus, Diplognathodus coloradoensis, D. ellesmerensis, D. orphanus, Declinognathodus lateralis, D. noduliferus, Neogondolella clarld, Idiognathndus delicatus, and Streptognathodus elegantulus. Based on these conodonts, the Neognathodus bothrops Zone was established. These conodonts and the biozone indicate that the geologic age of the Manhang Formation is the Atokan age of the Middle Carboniferous. Conodonts from the limestones of the Geumcheon Formation are Neognathodus medexultimus, N. roundyi, N. dilates, Gondolella bells, Diplognathodus coloradoensis, D. edentulus, D. papilla, Hindeodus minutes, Idiognathodus delicatus, and Streptognathodus elegantulus. Based on these conodonts, the Neognathodus roundyi Zone was established. These conodonts and the biozone indicate that the geologic age of the Geumcheon Formation is Desmoinesian age of the Middle Carboniferous.