The author was invited to attend as our Departmental delegate at the Baas Becking Geobiological Laboratory biannual meeting. The meeting was held at Bruce Hall, Australian National University, on the morning of 2 April, 1974. The author also took the opportunity of conferring with Dr M.R. Walter (Australian Commonwealth Bureau of Mineral Resources) and of examining his recently collected but as yet not studied stromatolite material from the Amadeus and McArthur basins.