https://repository.kopri.re.kr/handle/201206/5218 2026-04-16T01:39:51Z https://repository.kopri.re.kr/handle/201206/5688 Title: Cambrian stratigraphy of the North China Platform: revisiting principal sections in Shandong Province, China Authors: Chough, S.K.; Z. Han; H.S.Lee; T.-y.Park; J.Chen; I.Kang; S.-b.Lee; D.K.Choi; Woo, Jusun Abstract: The Cambrian succession in the North China Platform comprises a mixed carbonate-siliciclastic sequence, superbly exposed in the southern part of Shandong Province, China. In order to refine the lithostratigraphy of the Cambrian succession, this paper presents detailed sedimentary logs of outcrop sections in the Jinan, Laiwu, Jining, and Linyi areas. The entire succession consists of six lithologic units: Liguan, Zhushadong, Mantou, Zhangxia, Gushan, and Chaomidian formations in ascending order. The upper boundary of the Zhushadong Formation is refined as the base of the first purple mudstone bed of the Mantou Formation. The Mantou Formation is, in turn, bounded at the top by a thick oolitic grainstone bed of the Zhangxia Formation. The upper boundary of the Gushan Formation is placed at the base of a distinct bioclastic grainstone bed of the Chaomidian Formation. The constituent members of the Zhushadong, Mantou, and Chaomidian formations are also refined. Seventeen trilobite biozones are recognized, representing the Cambrian Series 2 to the Furongian. 2010-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/8072 Title: Stratigraphy of the Paleozoic Successions in the Victoria Land and the Transantarctic Mountains Authors: Woo, Jusun 2010-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/8058 Title: Middle Cambrian microbial-metazoan reef, Zhangxia Formation, Shandong Province, North China Authors: Woo, Jusun; Chough, S.K. Abstract: Middle and Upper Cambrian reefs were constructed mostly by stromatolite and thrombolite because the previously flourished archaeocyaths went extinct at the end of the Early Cambrian, and new reefal metazoans did not evolve until the Ordovician. Although some sponges were reported from middle Cambrian reefs, their diversity was very low (mostly single taxon) and their role in the reef was limited. Here, we report relatively diverse reefal metazoan community from the Middle Cambrian Zhangxia Formation (Changhian Stage) and discuss their paleoenvironmental implications. The Zhangxia Formation in central Shandong Province consists mainly of oolite, bioturbated wackestone and microbial carbonates of thrombolite, dendrolite and stromatolites. Microbial bioherms in the lowermost part of the formation (Crepicephalina Zone) are characterized by metazoan community of sponges and octagonal cone-shaped organisms (OCOs, uncertain affinity). The reefs were built by stacks of several layers (about 20 cm in thickness) of microbial and metazoan buildups. Most of the layers formed by lateral train of small thrombolite and stromatolite bioherms containing calcimicrobes such as Epiphyton, Renalcis, Angulocelluria and Girvanella. Metazoan- rich bioherms usually occur along certain layers. The base of the metazoan-rich bioherm consists of coalescent small bioherms of thrombolite containing few sponges or OCOs. Large tube-shaped anthaspidellid sponges usually started growing on the top of the stabilized surface of this thrombolite aggregates. Attachment of smaller sponges and OCOs on the large sponges resulted in framework of reef body. OCOs usually showed pendent-style growth mode attaching to the lower surface or side wall of the large sponges. Large masses of Epiphyton, most likely, developed on the thrombolitic surface, coexisting with other metazoans. Epiphyton masses usually formed finger-like body with layered texture by arrayed short branches. Theses metazoan and Epiphyton masses 2010-01-01T00:00:00Z