InhaltsangabeList of contributors. Preface to the first edition. Preface to the second edition. Preface to the third edition. I Largescale controls and variability in drylands. 1 Arid environments: their nature and extent (David S.G. Thomas). 1.1 Geomorphology in arid environments. 1.2 Arid zone distinctiveness and the quest for explanation. 1.3 Arid zones: terminology and definitions. 1.4 The age of aridity on Earth. 1.5 The distribution of arid zones. 1.6 Causes of aridity. 1.7 Climate variability. 1.8 Dryland ecosystems. 1.9 Arid zone geomorphology and people. 1.10 Organisation of this book. 2 Tectonic frameworks (Helen Rendell). 2.1 Introduction. 2.2 Tectonic setting of drylands. 2.3 Uplift and erosion, subsidence and sedimentation. 2.4 Lengths of record. 2.5 Existing erosional and depositional records in arid environments. 2.6 Selected examples of the geomorphological impact of active tectonics in arid environments. 2.7 Conclusions. 3 Climatic frameworks: legacies from the past (David S.G. Thomas and Sallie L. Burrough). 3.1 Introduction. 3.2 The significance of arid zone fluctuations in the past. 3.3 Dating arid zone fluctuations. 3.4 Climatic interpretations and issues. 3.5 Conclusions. 4 Dryland system variability (David S. G. Thomas). 4.1 A framework for dryland diversity. 4.2 Geomonotony: how unvarying are the 'flat' drylands of the world? 4.3 Withindryland diversity. 4.4 Summary issues. 5 Extraterrestrial arid surface processes (Jonathan Clarke). 5.1 Introduction. 5.2 What does 'aridity' mean beyond Earth? 5.3 Why should planetary scientists understand terrestrial arid geomorphology? 5.4 What can terrestrial geomorphologists learn from a solar system perspective? 5.5 Mars: water-based aridity. 5.6 Titan: methane-based aridity? 5.7 Venus: extreme aridity. 5.8 Future Directions. II Surface processes and characteristics. 6 Weathering systems (Heather A. Viles). 6.1 Introduction. 6.2 What makes arid environments unusual in terms of weathering systems? 6.3 Theoretical underpinnings of weathering systems research. 6.4 Current weathering study methods. 6.5 Linking processes to form in arid weathering systems. 6.6 Explaining the development of weathering landforms in arid environments. 6.7 Weathering rates in arid environments. 6.8 Arid weathering and landscape evolution. 6.9 Scale and arid weathering systems. 7 Desert soils (David L. Dunkerley). 7.1 Introduction: the nature and significance of desert soils. 7.2 Taxonomy of desert soils. 7.3 Some distinctive aspects of desert soil development. 7.4 Stonemantled surfaces and desert pavements. 7.5 Inorganic seals at the soil surface. 7.6 Vesicular soil structures. 7.7 Conclusions. 8 Desert crusts and rock coatings (David J. Nash). 8.1 Introduction. 8.2 Sodium nitrate deposits. 8.3 Halite crusts. 8.4 Gypsum crusts. 8.5 Calcrete. 8.6 Silcrete. 8.7 Desert rock coatings. 8.8 Palaeoenvironmental significance of crusts. 9 Pavements and stone mantles (Julie E. Laity). 9.1 Introduction. 9.2 Surface types: hamadas and stony surfaces. 9.3 General theories concerning stony surface formation. 9.4 Stone pavement characteristics. 9.5 Processes of pavement formation. 9.6 Processes of clast size reduction in pavements. 9.7 Secondary characteristics of pavement surfaces and regional differences in pavement formation. 9.8 Secondary modifications to pavement surfaces. 9.9 Ecohydrology of pavement surfaces. 9.10 Relative and absolute dating of geomorphic surfaces based on pavement development. 9.11 Conclusions. 10 Slope systems (John Wainwright and Richard E. Brazier). 10.1 Introduction. 10.2 Badlands. 10.3 Rock slopes. 10.4 Conclusion. III The work of water. 11 Runoff generation, overland flow and erosion on hillslopes (John Wainwright and

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