Author's Organization:Department of Earth Science,Iwamizawa College,Hokkaido University of Education Imakane Educational Committee Imakane Town Office Hokkaido Hiyamakita Senior High School Department of Earth Science,Iwamizawa College,Hokkaido University of Education
Published: March 15, 1994Received: June 03, 1993Available on J-STAGE: April 11, 2008Accepted: November 15, 1993
Advance online publication: -
Revised: -