Cyrtospirifer and Leptophloeum from the Devonian Rosse Formation, Hida Gaien Belt, central Japan

• Published in: Chishitsugaku zasshi Vol. 106; no. 10; pp. 727 - 735
• Main Authors: Tazawa, Jun-ichi, Yang, Wei-ping, Miyake, Yukio
• Format: Journal Article
• Language: Japanese; English
• Published: Tokyo The Geological Society of Japan 01.10.2000; Japan Science and Technology Agency
• Subjects: Upper Devonian
• ISSN: 0016-7630; 1349-9963
• DOI: 10.5575/geosoc.106.727

Late Devonian brachiopod Cyrtospirifer and lepidodendroid plant Leptophloeum are newly recorded from the Hida Gaien Belt, central Japan. The fossils, collected from light green acidic tuff of the upper part of the Rosse Formation in the Moribu area, Hida Gaien Belt, are named as and identified as Cyrtospirifer sp. A, Cyrtospirifer sp. B and Leptophloeum rhombicum Dawson. From the fossil evidence, the upper part of the Rosse Formation is clearly correlated with the Upper Devonian. In common with both the South Kitakami and Kurosegawa Belts, the Hida Gaien Belt is characterized by the presence of pyroclastic and clastic Upper Devonian units containing Cyrtospirifer and Leptophloeum. The above three belts were probably connected biogeographically and also geographically with the eastern Kazakhstan-northern Xinjiang-Inner Mongolia region in the Late Devonian time.