Recent data on the composition of the lunar surface indicates that material of tektite composition is not present at the sites sampled. The hypothesis of terrestrial impact origin for the Australian and east Asian tektite strewn field, which is supported by geochemical evidence, is examined. The apparent absence of a deep crater (analogous to the Arizona crater) indicates that high density (meteorite or asteroid) objects were not involved. The surface evidence expected from impact of a low density comet (analogous to the Tunguska event) is examined. It is suggested that the Australian and east Asian tektites originated in a super-Tunguska event, and search for wide shallow craters should be concentrated in areas of appropriate composition (sub-greywacke sandstone).