The highest award of the Geological Association of Canada is presented to an individual for sustained distinguished achievement in Canadian earth science.
2025 Logan Medallist
Dr. Galen Halverson (McGill University)
Awarded for his sustained efforts and outstanding contributions as a stratigrapher, sedimentologist, and isotope geochemist to interrogate the rock record and infer Earth’s geographic, tectonic, and environmental evolution during the Proterozoic Eon.
Professor Galen Halverson is chair of the Department of Earth and Planetary Sciences at McGill University, where he holds the James McGill Professorship and is the T.H. Clark Chair of Sedimentology and Petroleum Geology. Dr. Halverson is among the world’s foremost experts on the Proterozoic Eon, which encompassed the assembly and disintegration of the supercontinents Nuna and Rodinia, the Great Oxidation Event, the origin and early diversification of eukaryotic organisms, and multiple global glaciations. Dr. Halverson’s early research, based on extensive fieldwork in the Canadian Arctic, Norway and Namibia, focused on understanding Cryogenian glaciations, including the formulation and testing of the Neoproterozoic snowball Earth hypothesis. He subsequently developed a chronological framework for the Neoproterozoic Era (1000–539 million years ago), which was used to understand the secular evolution of the carbon, strontium, and sulfur isotope compositions of seawater during this time. With his collaborators and students, he has further developed and applied multiple different isotope systems to the Proterozoic, including nitrogen, iron, zinc, uranium, barium, and neodymium. He has worked extensively on the origin and stratigraphic records of sedimentary basins in northern Canada and across the globe over the past two decades, and this work has yielded new fossils, radiometric ages, and geochemical records that have collectively provided great insight into our understanding of the tectonic, biological, and biogeochemical change through the Proterozoic Eon. He has contributed to calibrating the Proterozoic geologic time scale through a combination of geochronology, astrochronology, and Bayesian age modelling techniques.
The deadline for National Medal nomination forms is January 5th, 2025
Previous Award Winners
2024 Dr. Sandra Barr
2023 Sandra L. Kamo
2022 Brendan Murphy
2021 Kurt Konhauser
2020 Margot McMechan
2019 Cees van Staal
2018 Barbara Sherwood Lollar
2017 Roy Hyndman
2016 Brian Jones
2015 Richard Grieve
2014 Andrew Miall
2013 George Pemberton
2012 Robert Kerrich
2011 Anthony E. Williams-Jones
2010 Christopher Barnes
2009 Noel James
2008 James M. Franklin
2007 John Clague
2006 Claude Hillaire-Marcel
2005 Ron M. Clowes
2004 Stewart Blusson
2003 Fred Longstaffe
2002 James Monger
2001 S.E. Calvert
2000 H. Gabrielse
1999 R. G. Walker
1998 D.F. Sangster
1997 E. W. Mountjoy
1996 F. C. Hawthorne
1995 J. Veizer
1994 A. J. Naldrett
1993 P. Cerny
1992 P. F. Hoffman
1991 J. R. Mackay
1990 R. L. Armstrong
1989 T. E. Krogh
1988 H. Williams
1987 D. J. Mclaren
1986 M. J. Keen
1985 R. A. Price
1984 D. W. Strangway
1983 J. O. Wheeler
1982 C. R. Stelck
1981 W. S. Fyfe
1980 G. V. Middleton
1979 R. Thorsteinsson
1978 A. Remanis
1977 A. R. Barringer
1976 R. J. W. Douglas
1975 E. Irving
1974 Y. O. Fortier
1973 C. H. Stockwell
1972 R. F. Leggett
1971 T. H. Clark
1970 D. R. Derry
1969 J. M. Harrison
1968 J. T. Wilson
1967 J. E. Gill
1966 H. C. Gunning
1965 W. A. Bell
1964 H. E. Hawley