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Paleontological Research
Abstract
Abstract.
An Early Cretaceous radiolarian fauna is found from the Tagaung Taung area, central Myanmar. The fauna consists of the following species: Acanthocircus dicranacanthos (Squinabol), Stylosphaera squinaboli Tan Sin Hok, Hiscocapsa cf. subcrassitestata (Aita), Svinitzium cf. depressum (Baumgartner), Thanarla brouweri (Tan Sin Hok), Archaeodictyomitra mitra Dumitrica, Archaeodictyomitra apiarium (Rüst), Archaeodictyomitra vulgaris Pessagno, Hemicryptocapsa cf. pseudopilula Tan Sin Hok, Hemicryptocapsa capita Tan Sin Hok, Holocryptocapsa hindei Tan Sin Hok and Cryptamphorella challengeri Schaaf. These species indicate clearly an Early Cretaceous age (Hauterivian), and therefore this is the first report on Cretaceous radiolarians from Myanmar.
The authors are thankful to Masanaru Takai (Primate Research Institute of Kyoto University) and Zin Maung Maung Thein (Magway University) for their suggestions concerning palaeontological research in Myanmar. They also thank Terufumi Ohno (Kyoto University Museum) for his kind offer of using a scanning electron microscope of Kyoto University Museum. The authors express special thanks to Luis O'Dogherty for his discussion of radiolarian dating during the INTERRAD XV conference in Niigata, Japan, and to Špela Goričan and Yojiro Taketani for their fruitful comments during the review of this manuscript. The authors thank Felix Schlagintweit for his comments on Cretaceous foraminifers from the That-tu bedded chert. Parts of this study have already been presented in the 2006 annual meeting of the Palaeontological Society of Japan in Matsue, the 15th Meeting of the International Association of Radiolarists in 2017 in Niigata, and the Inaugural Conference on Applied Earth Sciences in Myanmar and Neighboring Regions (MAESA 2017) in Yangon. The authors are also grateful for many discussions during these conferences. Part of this study was financially supported by research funds of Otani University and a Grant-in-Aid for Scientific Research on Innovative Areas from JSPS (Japan Society for the Promotion of Science) (KAKENHI Grant Number JP26106005).
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