Global silica cycle paced by astronomical cycles recorded in the Mesozoic bedded chert: Implications for early Mesozoic extinctions

Masayuki Ikeda, Shizuoka University, Shizuoka, Japan, Kazumi Ozaki, Georgia Institute of Technology, School of Earth and Atmospheric Sciences, Atlanta, GA, United States and Ryuji Tada, University of Tokyo, Bunkyo-ku, Japan