A New Species of Amsassia from the Ordovician of Korea and South China: Paleobiological and Paleogeographical Significance

Mirinae LEE, Heeju PARK, Nguyen Viet TIEN, Suk-Joo Choh, Robert J. ELIAS, Dong Jin LEE

Research output: Contribution to journalArticle

3 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)796-806
Number of pages11
JournalActa Geologica Sinica
Volume90
Issue number3
DOIs
Publication statusPublished - 2016 Jun 1

Keywords

  • Amsassia koreanensis sp. nov.
  • Ordovician
  • paleobiology
  • paleogeography
  • Sino-Korean Block
  • South China Block

ASJC Scopus subject areas

  • Geology

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