Japan Geoscience Union Meeting 2015

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Oral

Symbol B (Biogeosciences) » B-PT Paleontology

[B-PT27] End-Proterozoic/Phanerozoic biodiversity change: extinction and radiation

Sun. May 24, 2015 11:00 AM - 12:45 PM 104 (1F)

Convener:*Yukio Isozaki(Department of Earth Science and Astronomy, Multi-disciplinary Sciences - General Systems Studies, Graduate School of Arts and Sciences, The University of Tokyo), Yusuke Sawaki(Tokyo Institute of Technology), Chair:Yukio Isozaki(Department of Earth Science and Astronomy, Multi-disciplinary Sciences - General Systems Studies, Graduate School of Arts and Sciences, The University of Tokyo)

12:30 PM - 12:33 PM

[BPT27-P01] Spongy parenchyma found in meta-tuff of Hitachi Cambrian Akazawa Formation

3-min talk in an oral session

*Michio TAGIRI1, Katsutoshi HANAWA2, Akira OIKAWA2 (1.Hitachi City Museum, 2.Geonet Hitachi)

Keywords:Hitachi Cambrian, meta-tuff, spongy parenchyma, sphere

Hitachi Cambrian meta-tuffs containing spongy parenchyma occur as gravels in the Miyata River and the Ayukawa River. Spongy parenchyma consists of siliceous sphere with several layers and dark matrix. This texture is not like to siliceous oolite, pisolite, and spherulite, but to silicified sponge.