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Mirinae Lee,Heeju Park,Nguyen Viet Tien,Suk-Joo Choh,Robert J. Elias,Dong-Jin Lee.2016.A New Species of Amsassia from the Ordovician of Korea and South China: Paleobiological and Paleogeographical Significance[J].Acta Geologica Sinica(),90(3):796-806
A New Species of Amsassia from the Ordovician of Korea and South China: Paleobiological and Paleogeographical Significance    Download PDF
Mirinae Lee  Heeju Park  Nguyen Viet Tien  Suk-Joo Choh  Robert J. Elias  Dong-Jin Lee
This study was supported by a grant from 2015 Research Fund of Andong National University. J.-H. Lee (Chungnam National University) provided constructive comments on the initial manuscript. We thank H.J. Cho, N.K. Kim and J. Jeon (Andong National University) for preparation of thin sections. The reviewer and editor are acknowledged for their helpful suggestions.
DOI:
Abstract:
      A new species of the probable calcareous alga Amsassia, A. koreanensis, is recognized from the Duwibong Formation (Middle Ordovician, Darriwilian) of the Taebaeksan Basin in mid-eastern Korea. This is the first report of the genus from the Korean Peninsula, expanding its geographical range to the eastern Sino-Korean Block. The new species also occurs in the Xiazhen Formation (Upper Ordovician, Katian) at Zhuzhai in the South China Block. Amsassia koreanensis is the smallest species of this modular genus, having a maximum module diameter of 0.28 mm. Module increase is by bipartite, tripartite and quadripartite types of longitudinal axial fission, but unlike other species of the genus, quadripartite fission is common. The types of fission are comparable to those in some Tetradiida (now Prismostylales, florideophycean rhodophyte algae), although the processes of fission are different. The distribution of A. koreanensis further strengthens the biogeographical connection between the Sino-Korean and South China blocks, suggesting that these two paleocontinents were located closer together during the Middle to Late Ordovician than previously speculated.
Key words:Amsassia koreanensis sp. nov., Ordovician, Sino-Korean Block, South China Block, paleobiology, paleogeography.
A New Species of Amsassia from the Ordovician of Korea and South China: Paleobiological and Paleogeographical Significance    Download Fulltext
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