ISSN■ 340-74■ OKAYAMA UNiVERSiTY Earth Scler Vol.7, No.1, 2000 CONTE:NTS Automated observation of sea surface eddy nux On a cruising ship Satoshi TAKAHASHI,Osamu TSUKAMOTO,Hiroshi ISHIDA and Kunio YONEYAMA .....・・ S―wave velocity structure estiェ nated froIIl long‐ period cOda waves Hitoshi ODA and AkiITO .....・・・・・・・・・・・・・・・・・・・・ 15 Native gold fron■ Mikawa H■ ine,Niigata PreFecture,Japan Jun31 YAMAKAWA,Mitsuo TANABE,Kazumasa SHIMADA and Chiyoko HENMI 19 Waterosoluble materials fbrmed by the reactiOn between a volcanic rock and HCl and/or S02 Seishi AKAGI and Masahiro YAMA馳 IOTO .....・・・・・・・・・・・・ 21 Chen■ ical composition of clinOpyroxenes associated with the cho, gehlenite skarn froIIl the Hirata outcrop,KushirO,TOjo‐ Hiroshilna PreFecture,Japan Chiyoko HENMI,Isao KUSACHI and Tatsuya KAGEYAttIA.....・・・・・ 27 Relationships between``Mountain Gravels"and the]Bizen and ToH■ lhara Coal Measures,northern Ottama City9 SOuthwest Japan Shigeyuki SUZUKI,Ketti NAKAZAWA and Httime TANAKA .....・・・・ 35 Tidal notch cut into the Narlligata Lilnestone,240 111 above sea level, I b a F a C i t y , O k a y a m a P r e f e c t u r e Takao FUJIWARA,Shigeyuki SUZUKI and Yasuo WIAEDA .....・ A New Species ofあづけんθsけ ro抗ο角 (SつんθηοttCれ冴rO角)(Rugosa)from the Hina Lilnestone,Ottama PreFecture,Southwest Japan Nobuo YAMAGIWA,Shigeyuki SUZUKI and Y可 1 0KIMURA .....・・・・・ 41 ・・・ 47 ◆ Departtnent of Earth Sciences Faculty of Science,OKAYAMA UNIVERSITY l-1,Tsushima― N aka 3chome,OKAYAMA 700-8530,JAPAN 4