First report of Cystostroma (Stromatoporoidea; Ordovician) from Sino-Korean Craton

Jae Ryong Oh, Suk-Joo Choh, Dong Jin Lee

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A primitive stromatoporoid Cystostroma is reported from the Middle Ordovician Duwibong Formation of Taebaeksan Basin for the first time in Korea, which occupies the eastern margin of Sino-Korean Craton. It occurs as oncoid-like structures with hemispheroidal thin laminae and stromatolite-like columns composed mainly of stacked domal to bulbous encrusting laminae alternating with bryozoans. The former mainly occur within grainstone facies whereas the latter are surrounded by muddy facies. These contrasting growth forms may have resulted from the differences in energy-level and/or effect of intergrowth with other encrusting organisms. Though internal texture of Cystostroma is poorly preserved, application of the “white card technique” reveals imbricated small convex-upward cysts which are diagnostic of the genus. Previously reported occurrences of early Cystostroma are confined to the upper Middle Ordovician Chazy Group of North America which is more-or-less contemporaneous with the Duwibong Formation in age. The Sino-Korean Craton contains considerable records of early stromatoporoids and the present study adds another occurrence of a primitive stromatoporoid Cystostroma which may have possibly been related to the origination of stromatoporoids in the region. This finding is expected to provide a better understanding for the origin and dispersal of early stromatoporoids during the Early Paleozoic.

Original languageEnglish
Pages (from-to)25-31
Number of pages7
JournalGeosciences Journal
Volume19
Issue number1
DOIs
Publication statusPublished - 2015

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craton
Ordovician
encrusting organism
stromatolite
grainstone
growth form
cyst
Paleozoic
texture
basin
energy
North America
effect

Keywords

  • Cystostroma
  • Duwibong Formation
  • Middle Ordovician
  • Sino-Korean Craton
  • stromatoporoid

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

First report of Cystostroma (Stromatoporoidea; Ordovician) from Sino-Korean Craton. / Oh, Jae Ryong; Choh, Suk-Joo; Lee, Dong Jin.

In: Geosciences Journal, Vol. 19, No. 1, 2015, p. 25-31.

Research output: Contribution to journalArticle

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