Author's Organization：Department of Earth and Planetary Sciences,Faculty of Science,Kyushu University The Yamaguchi Prefectural Yamaguchi Museum Ube Weman's Senior High School /
Published: September 15, 1990Received: January 29, 1990Available on J-STAGE: April 11, 2008Accepted: June 18, 1990
Advance online publication: -
Revised: -
