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• Rolf Ludvigsen
  Department of Geology, University of Toronto, Toronto, Ontario.

• Stephen R. Westrop
  Department of Geology, University of Toronto, Toronto, Ontario; present addresses: Department of Earth Sciences, Memorial University of Newfoundland, St. John's, Newfoundland.

• Brian R. Pratt
  Department of Geology, University of Toronto, Toronto, Ontario.

• Pamela A. Tuffnell
  Department of Geology, University of Toronto, Toronto, Ontario; present addresses: Department of Geology, University of Alberta, Edmonton, Alberta.

• Graham A. Young
  Department of Geology, University of Toronto, Toronto, Ontario; present addresses: Department of Geology, University of New Brunswick, Fredericton, New Brunswick.