Publ. à l'occasion du soixantième anniversaire de Wolfgang Gentner

Préf., by O.A. Schaeffer and J. Zähringer. - History of the K-Ar method of geochronology, by F.G. Houtermans. - Determination of radiogenic argon, by T. Kirsten. - Potassium analysis, by O. Müller. - The diffussion of argon in potassium-bearing solids, by H. Fechtig and S. Kalbitzer. - K-Ar dating of precambrian rocks, by G.W. Wetherill. - K-Ar dating of plutonic and volcanic rocks in orogenic belts, by R.L. Armstrong. - K-Ar dating of sediments, by P.M. Hurley. - The problem of contamination in obtaining accurate dates of young geologic rocks, by G.H. Curtis. - Tektites, by O.A. Schaeffer. - K-Ar ages of meteorites, by D. Krankowsky and J. Zähringer