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This book contains review papers covering such issues as the geometrical characterization of porous solids and particle aggregates using synchroton radiation techniques. A review of the phenomenon of overpressuring primal global distribution of clay minerals, and the use of clays as barriers in waste disposal are also included.

This volume illustrates some of the significant aspects of magmatic activity from Devonian (408 million years ago) to early Permian (270 million years ago) times in SW England. This period covers the progressive development of the Variscan mountain-building episode, from initial basin formation to final deformation and the subsequent development of a fold mountain belt - the Variscan Orogen. Both extrusive (volcanic) and intrusive (plutonic) rocks are found in the orogen, and chart the various stages of its magmatic development. The sites described in this volume are key localities selected...