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The Ordovician and Silurian conodonts of Japan: Their biostratigraphical and paleobiogeographical significance
Author(s) -
Männik Peep,
Maekawa Takumi,
Tanaka Gengo,
Komatsu Toshifumi,
Siveter David,
Williams Mark,
Hints Olle,
Vandenbroucke Thijs R. A.
Publication year - 2018
Publication title -
island arc
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.554
H-Index - 58
eISSN - 1440-1738
pISSN - 1038-4871
DOI - 10.1111/iar.12269
Subject(s) - conodont , ordovician , geology , terrane , paleontology , biostratigraphy , tectonics
Conodont‐bearing Ordovician and Silurian rocks have a wide geographical distribution in Japan. They are exposed on Honshu, Shikoku, and Kyushu islands. Two recently studied samples from Gionyama, in Kyushu, yield conodont assemblages of Telychian ( Distomodus sp., Apsidognathus sp. (cf. A. tuberculatus arcticus ), Oulodus cf. rectangulus , Ozarkodina cf. waugoolaensis , Panderodus cf. amplicostatus ) and probably the earliest Sheinwoodian (? Distomodus sp. (cf. D. staurognathoides ), Ozarkodina sp., Oulodus sp., Walliserodus sp. (cf. Walliserodus sp. nov. c Männik), Panderodus sp.) ages, providing further biostratigraphical constraints for the age of the Gionyama Formation in the Kurosegawa Terrane. Most of the conodont taxa identified have wide paleobiogeographical distribution, but probable occurrence of Oulodus rectangulus , Ozarkodina waugoolaensis , and Panderodus amplicostatus suggests a relationship between Australia, the South China paleocontinent, and the Kurosegawa Terrane of ‘Proto‐Japan’ during the Silurian. These paleogeographic interpretations agree with the existing notions based on rugose corals.