About KITAMURA AKIHISA
About Isotope News (Web)
About tsunami
About season
About shell(exoskeleton)
About carbon 14
About oxygen isotope
About isotopic ratio
About sea water temperature
About Shizuoka prefecture
About tsunami deposit
About absolute age
About radiocarbon dating
About Pelecypoda
About aragonite
About delta O-18
About 14C Age
About Seismic activity
About 津波
About 季節
About 貝殻