publisher of Geological Society of America, 2003 annual meeting 2003 Geological Society of America, 2003 annual meeting 2003 Geological Society of America, 1999 annual meeting 1999 Geological Society of America, 1999 annual meeting 1999 Geological Society of America, North-Central Section, 33rd annual meeting 1999 Geological Society of America, 1997 annual meeting 1997 North-central Section, the Geological Society of America, 17th annual meeting 1983
