Trilobites del Furongiense medio (Cámbrico tardío) de la Zona Quadraticephalus de la Formación Hwajeol, Distrito de Taebaek, Corea
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2025
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10/06/2025
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Abstract
RESUMEN: La correlación internacional del Furongiense de China y Corea sigue siendo una tarea difícil, debido al bajo número de trilobites cosmopolitas. La Formación Hwajeol del Grupo Taebaek en Corea se extiende desde el Jiangshaniense hasta el Piso 10 del Cámbrico. Este estudio documenta trilobites silicificados de la parte media de la Formación Hwajeol en la sección Sagundari que pertenecen a la Zona Quadraticephalus, que está bien correlacionada con la Zona Changia (o Quadraticephalus) del norte de China y atribuida al Jiangshaniense tardío. Este intervalo produce al menos once especies de trilobites polímeridos pertenecientes a nueve géneros: Akoldinioidia, Baikadamaspis, Hamashania, Haniwa, Lophosaukia, Pagodia, Pseudokoldinioidia, Quadraticephalus y Shergoldia. Quadraticephalus elongatus está presente en todo el intervalo, por lo que la biozona se denomina Zona Quadraticephalus. Este nuevo conjunto de trilobites no sólo respalda un fuerte vínculo paleogeográfico entre el Complejo de Taebaeksan y el norte de China sino también una conexión sólida con otros terrenos de peri-Gondwana como el sur de China, Australia y Sibumasu.
ABSTRACT: The international correlation of the Furongian of Sino-Korea remains a challenging task, owing to the low number of cosmopolitan trilobites. The Hwajeol Formation of the Taebaek Group in Korea extends from the Jiangshanian Stage to Cambrian Stage 10. This study documents silicified trilobites from the middle part of the Hwajeol Formation in the Sagundari section that belong to the Quadraticephalus Zone, which is well correlated with the Changia (or Quadraticephalus) Zone of North China and attributed to the late Jiangshanian Stage. This interval yields at least eleven polymerid species belonging to nine genera: Akoldinioidia, Baikadamaspis, Hamashania, Haniwa, Lophosaukia, Pagodia, Pseudokoldinioidia, Quadraticephalus, and Shergoldia. Quadraticephalus elongatus occurs throughout the interval, hence the biozone is named as the Quadraticephalus Zone. This new trilobite assemblage thus not only support a strong palaeogeographical link between the Taebaeksan Complex and North China but also a solid connection with other peri-Gondwanan terranes such as South China, Australia, and Sibumasu.
ABSTRACT: The international correlation of the Furongian of Sino-Korea remains a challenging task, owing to the low number of cosmopolitan trilobites. The Hwajeol Formation of the Taebaek Group in Korea extends from the Jiangshanian Stage to Cambrian Stage 10. This study documents silicified trilobites from the middle part of the Hwajeol Formation in the Sagundari section that belong to the Quadraticephalus Zone, which is well correlated with the Changia (or Quadraticephalus) Zone of North China and attributed to the late Jiangshanian Stage. This interval yields at least eleven polymerid species belonging to nine genera: Akoldinioidia, Baikadamaspis, Hamashania, Haniwa, Lophosaukia, Pagodia, Pseudokoldinioidia, Quadraticephalus, and Shergoldia. Quadraticephalus elongatus occurs throughout the interval, hence the biozone is named as the Quadraticephalus Zone. This new trilobite assemblage thus not only support a strong palaeogeographical link between the Taebaeksan Complex and North China but also a solid connection with other peri-Gondwanan terranes such as South China, Australia, and Sibumasu.