Spongy parenchyma found in meta-tuff of Hitachi Cambrian Akazawa Formation

Michio TAGIRI; Katsutoshi HANAWA; Akira OIKAWA

Presentation information

Poster

Symbol B (Biogeosciences) » B-PT Paleontology

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

Sun. May 24, 2015 6:15 PM - 7:30 PM Convention Hall (2F)

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)

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6:15 PM - 7:30 PM

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

*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.