Veress Márton: A Bakony természettudományi kutatásának eredményei 23. - Covered karst evolution... (Zirc, 2000)

PREFACE (Jakucs, L.)

of well-documented field work in itself is outstanding. The study of karst objects from various points of view and their relation to the individual elements of non-karstic surfaces are exemplary. Author's photos, figures, maps and profiles all attest to a researcher great experience, who is brave enough to produce new working hypotheses and puts forward ingenious ideas for the solution of the problems identified. I find it an excellent recognition that the shape of chimneys is controlled by rock dip. The creation of concepts of pseudoponor and pseudobathycapture are justified and the distinction between subsidence pseudodolines, dolines-with-pseudoponors and postgenetic dolines-with-ponors. In nature products of rather contrasting processes often occur together. In such cases the complexity of influencing factors should also be presented in the morphogenetic interpretation of the landscape. Approaches very unusual in geomorphology but nevertheless interesting are followed in the chapter „ Types of karst development", where the dynamics and landforms of karst erosion are grouped according to the morphology of the underlying rock surface and how cover sediments are removed from this surface (by fluvial processes, sheet wash or material transport at depth). Great attention is devoted to the typical features of karstification on covered escarpments, karst cones and in the valleys. In the exhumation of karstic basement a decisive role is attributed to'the dimensions of blocks and cones. Precise definitions are provided for the concepts of syngenetic and postgenetic karst development and detailed analyses are supplied for possible interactions between rock cavernation and valley formation . Szeged, 1999. March László Jakucs Professor Emeritus