John W.M. Jagt joint editor of the “Contributions” The W.T.K.G. council is happy to announce that from now on Mr J. W.M. Jagt, Venlo, The Netherlands, will act as joint editor of the “Contributions to Tertiary and Quaternary Geology"""". The fact that a second editor is necessary demonstrates that our periodical reaches maturity. Hopefully Mr Jagt (who is a graduate in English language) will contribute in editing the periodical for quite a long time! Jubilee volume of the “Contributions” In the year 1988 the 25th volume of the “Contributions” will be published, which of course is a good occasion to produce something special. There are plans for at least some thematic issues, the first one of which was already decided. It will contain the texts of the Zuurland well symposium, which was organized on 14 November 1986 at the occasion of the Van der Lijn award presentation to Mr L.W. Hordijk, a W.T.K.G. fellow-member who brought down the Zuurland well.