Briefing

This issue of Geology Today is devoted largely to the Earth sciences in Wales, in celebration of Welsh Geology Week (4–14 July 1991). The rationale of the Week and some of the activities taking place during it were described in our last issue (v. 7, p. 86, 1991).We are grateful to Michael G. Bassett of the National Museum of Wales, and his colleagues, for commissioning the Welsh articles and, of course, to the authors for writing them. Because of the nature of the material, the format of this issue differs some‐ what from our usual practice, but normal service in that respect will be resumed with the next issue. In‐ cidentally, as this is the first time we have produced a 'special issue', we would like to hear from readers on whether or not they welcome it and whether or not they would appreciate other such issues, either geographical or thematic, in the future.