Upper Triassic (Carnian) reef biota from the Sambosan Accretionary Complex, Kyushu, Japan

B. Senowbari-Daryan, G. D. Stanley, T. Onoue

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Calcified sponges, algae, and reef problematica are abundant yet poorly known from the Triassic of Japan. They are abundant in shallow-water carbonate, redeposited blocks of the Sambosan Accretionary Complex, Konosé Group, and southern Kyushu. Based on study of thin-sections from reef limestone exposed along the Kuma River, some important organisms and reef microfacies are described, which seem typical of Upper Triassic reef complexes. The most abundant reef organisms are hypercalcified sponges, including sphinctozoans, inozoans and chaetetids, followed by cyanophycean algae (including "Tubiphytes"-like organisms), and solenoporacean red algae. Loose sponge spicules in one thin-section also indicate the occurrence of rare hexactinellid sponges. Chambered demosponges described from the Konosé carbonate rocks include Solenolmia manon manon (Münster), Colospongia sp., Jablonskyia andrusovi (Jablonský), several unidentified chambered sponges as well as the inozoid Permocorynella sp. 1 and Permocorynella sp. 2. Also present are chaetetid sponges and solenoporacean red algae belonging to Parachaetetes cassianus (Flügel) and Parachaetetes? sp. or Solenopora? sp. Especially abundant in thin-sections are cyanophyceans and "Tubiphytes"-like organisms. Among the organisms is Cladogirvanella Ott and Hedstroemia sp. The composition of the biota and presence of typical problematic organisms increases our knowledge of shallow-water Upper Triassic carbonate rocks in a remote setting in western Panthalassa. The composition of the biota indicates a mostly Carnian age. Most comparable organisms are known from both the northeastern and southern Tethys.

Original languageEnglish
Pages (from-to)671-684
Number of pages14
JournalFacies
Volume58
Issue number4
DOIs
Publication statusPublished - Apr 16 2012

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Carnian
biota
sponge
reef
Triassic
thin section
red alga
carbonate rock
shallow water
alga
microfacies
spicule
organism
Tethys
limestone
carbonate
river

All Science Journal Classification (ASJC) codes

  • Geology
  • Stratigraphy
  • Palaeontology

Cite this

Upper Triassic (Carnian) reef biota from the Sambosan Accretionary Complex, Kyushu, Japan. / Senowbari-Daryan, B.; Stanley, G. D.; Onoue, T.

In: Facies, Vol. 58, No. 4, 16.04.2012, p. 671-684.

Research output: Contribution to journalArticle

Senowbari-Daryan, B. ; Stanley, G. D. ; Onoue, T. / Upper Triassic (Carnian) reef biota from the Sambosan Accretionary Complex, Kyushu, Japan. In: Facies. 2012 ; Vol. 58, No. 4. pp. 671-684.
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