Journal of Geography (Chigaku Zasshi)
Online ISSN : 1884-0884
Print ISSN : 0022-135X
ISSN-L : 0022-135X
Review Article
Mid-Permian Fusulinoidean Territories in Panthalassa
Shigeki HADAHiroya GOTO
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2022 Volume 131 Issue 1 Pages 1-21

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Abstract

 Two evolutionary lineages of the Neoshwagerinidae are recognized in the East Tethys-Panthalassa region in the mid-Permian time. These are the Misellina-Cancellina-Colania-Lepidolina and Misellina-Maklaya-Neoschwagerina-Yabeina evolutionary lineages. They formed distinctly isolated habitats in the Panthalassa region and are named the Colania-Lepidolina and Neoschwagerina-Yabeina territories, respectively. The paleogeographic distribution of the two territories is newly presented with an analysis of the Circum-Pacific accretionary complex combining the fusulinoidean faunas in mid-oceanic paleo-atoll limestones and the timing of their accretion clarified by radiolarian fossils. It is concluded that the Colania-Lepidolina territory expanded into a paleo-equatorial area in mid-Panthalassa with the Neoschwagerina-Yabeina territory at its southern side in the southern hemisphere. In East Paleo-Tethys, South China and Indochina continental blocks which were isolated in equatorial regions throughout the Permian period are striking territories characterized by an extension of the Lepidolina of the Colania-Lepidolina evolutionary lineage. On the Japanese Islands, Kurosegawa, Hida Gaien, South Kitakami and Maizuru belts are also characterized by the occurrence of Lepidolina.

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© 2022 Tokyo Geographical Society
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