[BCG07-P01] Investigation on the internal texture of demospongiae fossil in meta-tuff from the Cambrian Akazawa Formation, Hitachi district
Keywords:Cambrian formation, meta-tuff, demospongiae fossil, X-ray CT scan, cell form, recrystallized spicule
The stromal tissue of sponge fossil is occupied by very fine-grained silicate material, in which the sponge spicule-like texture develops, but this texture is completely replaced by fine acicular amphiboles. The sponge spicule did not remain in these fossils. However, whitish siliceous and micro-bubble bearing sponge texture still remains. Demospongiae fossil was formed by silicification in tuff.