| Conodonts from the Sesong Slate and Hwajeol Formation (Guzhangian to Furongian) in the Taebaeksan Basin, Korea |
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| 作者姓名： | Byung-Su Lee |
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| 作者单位： | Department of Earth Science Education, Chonbuk National University, Jeonju 561-756, Republic of Korea |
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| 基金项目： | This research was supported by the Basic Science Research Program through the National Research Foundation (NRF) of Korea funded by the Ministry of Education, Science and Technology (Grant No. 2012005044). |
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| 摘 要： | Abundant conodont elements have been recovered from the Hwajeol Formation, to allow five zones to be erected: Proconodontus, Eoconodontus notchpeakensis, Cambrooistodus minutus, Cordylodus proavus, and Fryxellodontus inornatus-Monocostodus sevierensis-Semiacontiodus lavadamensis zones, in ascending order. More confident biozones are recognized in the Sesong Slate and lower Hwajeol Formation in the Makgol section, a part of the southern limb of the Baekunsan syncline, Taebaeksan Basin, Korea, especially focusing on the conodont biostratigraphic boundary of two units, and the subdivision potential of the previous "Proconodontus Zone", lowermost biozone of the Hwajeol Formation. Similarly, only a few conodont elements recovered from upper 14.5 m interval, namely the Furongian portion of the Sesong Slate, in the Makgol section did not allow erection of a biozone. Nevertheless, this part of the unit plus the basal 2.5 m interval of the Hwajeol Formation is characterized by the occurrence of Prooneotodus rotundatus(Druce and Jones), Teridontus nakamurai(Nogami), Phakelodus elongatus(An) and Phakelodus tenuis Müller. This interval marks the early Furongian "Prooneotodus rotundatus Zone". The rest of the measured section yielded relatively abundant conodonts, so three conodont biozones are proposed, based on the successive appearance of key species: Proconodontus tenuiserratus, Proconodontus posterocostatus, and Proconodontus muelleri zones, in ascending order, and thus allowing subdivision of the previous "Proconodontus Zone". The four conodont biozones are correlated with the relevant biozones of North and South China, and North America.
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| 关 键 词： | 牙形石 芙蓉 板岩 盆地 韩国 太白山 生物带 生物地层 |
| 收稿时间： | 2013/5/31 0:00:00 |
| 修稿时间： | 2013/8/27 0:00:00 |
Conodonts from the Sesong Slate and Hwajeol Formation（Guzhangian to Furongian） in the Taebaeksan Basin,Korea |
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| Authors: | 《Acta Geologica Sinica》 |
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| Abstract: | Abundant conodont elements have been recovered from the Hwajeol Formation, to allow five zones to be erected: Proconodontus, Eoconodontus notchpeakensis, Cambrooistodus minutus, Cordylodus proavus, and Fryxellodontus inornatus‐Monocostodus sevierensis‐Semiacontiodus lavadamensis zones, in ascending order. More confident biozones are recognized in the Sesong Slate and lower Hwajeol Formation in the Makgol section, a part of the southern limb of the Baekunsan syncline, Taebaeksan Basin, Korea, especially focusing on the conodont biostratigraphic boundary of two units, and the subdivision potential of the previous “Proconodontus Zone”, lowermost biozone of the Hwajeol Formation. Similarly, only a few conodont elements recovered from upper 14.5 m interval, namely the Furongian portion of the Sesong Slate, in the Makgol section did not allow erection of a biozone. Nevertheless, this part of the unit plus the basal 2.5 m interval of the Hwajeol Formation is characterized by the occurrence of Prooneotodus rotundatus (Druce and Jones), Teridontus nakamurai (Nogami), Phakelodus elongatus (An) and Phakelodus tenuis Müller, This interval marks the early Furongian “Prooneotodus rotundatus Zone”. The rest of the measured section yielded relatively abundant conodonts, so three conodont biozones are proposed, based on the successive appearance of key species: Proconodontus tenuiserratus, Proconodontus posterocostatus, and Proconodontus muelleri zones, in ascending order, and thus allowing subdivision of the previous “Proconodontus Zone”. The four conodont biozones are correlated with the relevant biozones of North and South China, and North America. |
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| Keywords: | Conodontophirida micropaleontology biostratigraphy Guzhangian-Furongian Taebaeksan Basin Korea |
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