Early Permian (Sakmarian) brachiopods from Kamiyasse, South Kitakami Belt, northeast Japan

• Main Authors: Tazawa, Jun-ichi, 54321, Shintani, Tomohiko, 54322
• Language: English
• Published: 新潟大学理学部 2014
• Subjects: Brachiopoda; Kamiyasse; mixed Boreal–Tethyan fauna; Sakmarian; South Kitakami Belt; Kolyma; Pechora
• Online Access: https://niigata-u.repo.nii.ac.jp/record/6804/files/29_13-41.pdf

An early Permian (Sakmarian) brachiopod fauna, consisting of 20 species in 14 genera, is described from the basal part of the Nakadaira Formation in the Kamiyasse area, South Kitakami Belt, northeast Japan. The new species described here are Derbyia yukisawensis Tazawa and Shintani, Nipponirhynchia kamiyassensis Tazawa and Shintani, Spiriferellina nanbuensis Tazawa and Shintani and Crenispirifer nakamurai Tazawa and Shintani. The Kamiyasse fauna is a mixed Boreal–Tethyan fauna, and has some affinities with the early Permian brachiopod faunas of northern Russia (Kolyma, Pechora and the northern Urals), northwest China (Xinjiang) and north China (Inner Mongolia). Palaeobiogeographical data for the Kamiyasse fauna suggest that during the Sakmarian the South Kitakami region was probably located at mid-latitudes in the Northern Hemisphere, immediately east of North China (Sino-Korea). departmental bulletin paper