Two types of stromatolitic boulders occur in a diamictite of possibly Late Precambrian age in north-western Tasmania. The first type comprises dark grey dolomites containing the stromatolite Baicalia cf. B. burra, generally well preserved. The remainder are pale grey rather recrystallized dolomites containing stratiform and columnar-layered stromatolites. Their diagenesis and instrusion by dolomite veins preceded the erosion and redeposition of the clasts into the diamictite. There is no proof in the material submitted that either the well preserved Baicalia specimens or the recrystallized specimens occurring as clasts in the diamictite were derived from the Smithton Dolomite, which, according to the specimen submitted, is much more highly recrystallized. The occurrence of Baicalia cf. B. burra is consistent with a Late Precambrian age of the source rocks. Close comparisons can be made with the Skillogalee Dolomite of South Australia.