Redlichia nobilis Walcott, 1905, the oldest trilobite in South Korea: age and morphologic restoration by strain analysis

Yoon, Woon Sang; Lee, Dong‐Chan; Hong, Paul S.; Lee, Seungbae; Hong, Jongsun; Lee, Jeong-Gu

doi:10.1007/s12303-021-0036-0

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“…This new lithostratigraphic scheme allows to compare the basal Taebaek Group with coeval strata in the Sino-Korean Block. Resolution of the stratigraphic relationships within the basal Taebaek Group reveals the broad transgressive pattern of the Great Unconformity in the Sino-Korean Block (e.g., Kwon et al, 2006;J.-H. Lee et al, 2021) and its implications for the effects of the Cambrian Explosion in the region (e.g., Yoon et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Lithostratigraphic revision of the siliciclastic-dominated basal Taebaek Group (lower–middle Cambrian), Eastern Korea

Choi

Lee

et al. 2023

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The lithostratigraphic relationships among the basal Taebaek Group, including the Jangsan, Myeonsan, and Myobong formations, have been controversial until recently. It has long been assumed that the Jangsan and Myeonsan formations are lateral equivalents that are both conformably overlain by the Myobong Formation. However, recent studies have shown that the Jangsan is Precambrian in age and is unconformably overlain by the Cambrian succession, whereas the Myeonsan is a Cambrian unit. Accordingly, this study proposes a revised lithostratigraphic framework of the basal Taebaek Group. The Myeonsan Formation (Cambrian Age 3?) is defined here as a basal Cambrian succession consisting of a basal conglomerate and coarse-grained immature sandstone with detrital heavy minerals that unconformably overlies Precambrian basement. The Myobong Formation (~Cambrian Age 4-Wuliuan) is a fine-grained unit that conformably overlies the Myeonsan Formation. The Myobong is subdivided as follows: Seokpo Member of lenticular cross-laminated sandstone and siltstone; Daehyun Member of laterally continuous alternations of thin-bedded sandstone and siltstone with some carbonate-filled channels; Gurae Member of bioturbated sandstone. The Myeonsan Formation is comparable with lowermost Cambrian units in North China that formed during second-order transgression. Further sealevel rise led to the deposition of the Myobong Formation and its correlative units in North China.

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Section: Introductionmentioning

confidence: 99%