Glacial features in the D'Entrecasteaux valley

Abstract

In 1928 (Lewis, 1928) one of the present authors reported Silurian quartzite conglomerates in the valley of the D'Entrecasteaux River-Recherche Bay area-South-Western Tasmania. In so doing he was influenced by Twelvetrees (1915). Considering the matter more recently, it appeared that this occurrence might be of glacial origin. If this proved to be correct, the original site of these rocks must be westward of the La Perouse Range. An opportunity to visit this difficult locality has now presented itself. The rocks in question are undoubtedly of glacial origin, but they are Triassic grits, and not of Silurian age. No one can now be sure whether the series is the same as that reported by Twelvetrees, but from his very brief description this may be so. In any case, some further observations were made which are worth recording. This paper must he cconsidered merely as an amplification of the previous account (Lewis, 1928).