Author's Organization:Geological Laboratory,Faculty of Education,Fukui University Fukui Prefectural Children's Hall Geological Laboratory,Faculty of Education,Fukui University Geological Laboratory,Faculty of Education,Fukui University
Published: October 15, 1992Received: April 22, 1992Available on J-STAGE: April 11, 2008Accepted: June 25, 1992
Advance online publication: -
Revised: -