Introduction to the symposium on "Siliceous, Phosphatic and Glauconitic Sediments of the Tertiary and Mesozoic", A. Lijima et al; neogene siliceous, phosphatic and glauconitic sediments of the North-Western Pacific Rim - a comparison with the Eastern Pacific Rim, A. Lijima; what controls the deposition of bio-siliceous sediments in the Japan Sea?, R. Tada; sedimentary environment of the Onnagawa Sea - middle-Miocene Japanese back-arc trough, Y. Watanabe, et al; biomarker geochemistry and palaeoceanography of Miocene Onnagawa diatomaceous sedimets, Northern Honshu, Japan, M. Yamamoto and Y. Watanabe; occurrence and properties of glauconite in Miocene biosiliceous sediments of the Noto Peninsula, Hokuriku District, Japan, T. Nishimura; genesis of siliceous deposits in back-arc shelf basins of Kamchatka, A.R. Getner; the origin of chert in the Monterey Formation of California, USA, R.J. Behl and R.E. Garrison; sedimentation and diagenesis in palaeo-upwelling zones of epeiric sea and basinal settings - a comparison of the Cretaceous Mishash Formation of Israel and the Miocene Monterey Formation of California, Y. Kolodny and R.E. Garrison; are modern and ancient phosphorites really so different?, C.R. Glenn et al; phosphogenesis and the controls on phosphorus accumulation in continental margin sediments, G. Filippelli and M. Delaney; shallow marine phosphorite-chert-palygorskite association, upper-Cretaceous Amman Formation, Jordan, A.M. Abed; lithostratigraphy of Senonian phosphorite deposites in the Palmyridean region and their general sedimentological and palaeographic framework, A.Kh. Al Maleh and M. Mouty; sedimentary petrographical, geochemical and sedimentological aspects of the Triassic-Jurassic bedded cherts in South-West Japan, Y. Kakuwa.