ALBERT

Anmerkung: Contents Part I: Mafic rocks Introduction: Magmatic deposits associated with mafic rocks / A. J. Naldrett Sulfide melts: crystallization temperatures, solubilities in silicate melts, and Fe, Ni, and Cu partitioning between basaltic magmas and olivine / A. J. Naldrett Vapor associated with mafic magma and controls on its composition / E. A. Mathez Geochemistry of platinum-group elements in mafic and ultramafic rocks / E. A. Mathez & C. L. Peach Komatite-associated nickel sulfide deposits / C.M. Lesher Ores associated with flood basalts / A. J. Naldrett Contamination and the origin of the sudbury structure and its ores / A. J. Naldrett Stratiform PGE deposits in layered intrusions / A. J. Naldrett Interactions involving fluids in the stillwater and bushveld complexes: observations from the rocks / E. A. Mathez Part II: Silicic rocks Introduction: Ore deposits associated with silicic rocks / J.A. Whitney Origin and evolution of silicic magmas / J.A. Whitney Magmatic ore-forming fluids: Thermodynamic and mass-transfer calculations of metal concentrations / P.A. Candela Felsic magmas, volatiles, and metallogenesis / P.A. Candela Granitoid textures, compositions, and volatile fugacities associated with the formation of Tungsten-dominated skarn deposits / J.D. Keith, W. van Middelaar, A. H. Clark, & C. J. Hodgson

Anmerkung: Contents: List of contributors. - Preface. - 1 An Overview of Rates of Chemical Weathering / S. M. Colman and D. P. Dethier. - PART I KINETICS AND MECHANISMS OF WEATHERING REACTIONS. - 2 The Relations between Crystal Structure and Silicate Weathering Rates / R. A. Eggleton. - 3 The Dissolution Rate of Forsteritic Olivine from Hawaiian Beach Sand / D. E. Grandstaff. - 4 Stoichiometry of Alkali Feldspar Dissolution at Room Temperature and Various pH Values / G. R. Holdren, Jr. and P. M. Speyer. - 5 Rate Limitation and Dissolution of Highly Soluble Minerals / J. B. Laronne. - PART II RATES OF MINERAL ALTERATION IN SOIL ENVIRONMENTS. - 6 The Etching of Hornblende Grains in the Matrix of Alpine Tills and Periglacial Deposits / R .D. Hall and R. E. Martin. - 7 Rates of Hornblende Etching in Soils on Glacial Deposits, Baffin Island, Canada / W. W. Locke. - 8 Rates of Mineral Weathering in the Wind River Mountains, Western Wyoming / W. C. Mahaney and D. L. Halvorson. - 9 Evolution of Iron Crusts in Tropical Landscapes / D.B. Nahon. - 10 Processes and Rates of Weathering in Cold and Polar Desert Environments / F. C. Ugolini. - PART III WEATHERING OF VOLCANIC ASHES AND DEPOSITS. - 11 Weathering of Holocene Airfall Tephras in the Southern Canadian Rockies / R. H. King. - 12 Controls on the Rates of Weathering and Clay Mineral Genesis in Airfall Tephras: A Review and New Zealand Case Study / D. J. Lowe. - 13 Rates of Weathering of 14C-Dated Late Quaternary Volcaniclastic Deposits in the Western United States / V. E. Neall and I. K. Paintin. - 14 Chemical Weathering of the May 18, 1980, Mount St. Helens Ash Fall and the Effect on the Iron Creek Watershed, Washington / A. F. White and L. V. Benson and A. Yee. - PART IV RATES OF FORMATION OF ROCK-WEATHERING FEATURES. - 15 Levels of Time Information in Weathering Measurements, with Examples from Weathering Rinds on Volcanic Clasts in the Western United States / S. M. Colman. - 16 Weathering Rates in Granitic Boulders Measured by P-Wave Speeds / R. Crook, Jr. and A. R. Gillespie. - 17 Growth of Weathering Rinds on Torlesse Sandstone, Southern Alps, New Zealand / I. E. Whitehouse and M. J. McSaveney and P. L. K. Knuepfer and T. J. H. Chinn. - PART V HYDROCHEMICAL STUDIES OF RATES OF WEATHERING. - 18 The Mathematical Basis for Determining Rates of Geochemical and Geomorphic Processes in Small Forested Watersheds by Mass Balance: Examples and Implications / M. A. Velbel. - 19 An Estimate of Plagioclase Weathering Rate in the Idaho Batholith Based upon Geochemical Transport Rates / J. L. Clayton. - 20 The Use of Catchment Studies for Assessing Chemical Weathering Rates in Two Contrasting Upland Areas in Northeast Scotland / J. Creasey and A. C. Edwards and J. M. Reid and D. A. MacLeod and M. S. Cresser. - 21 Weathering Rates and the Chemical Flux from Catchments in the Pacific Northwest, U.S.A. / D. P. Dethier. - 22 Rates of Weathering and Erosion Derived from Mass Balance in Small Drainage Basins / T. Paces. - 23 Processes and Rates of Saprolite Production and Erosion on a Foliated Granitic Rock of the Virginia Piedmont / M. J. Pavich. - Index.

Anmerkung: J. B. Dawson, D. A. Carswell, J. Hall, and K.H. Wedepohl: Introduction / Geological Society, London, Special Publications, 24:vii-viii, doi:10.1144/GSL.SP.1986.024.01.01 --- R. Meissner: Twenty years of deep seismic reflection profiling in Germany—a contribution to our knowledge of the nature of the lower Variscan crust / Geological Society, London, Special Publications, 24:1-10, doi:10.1144/GSL.SP.1986.024.01.02 --- D. H. Matthews: Seismic reflections from the lower crust around Britain / Geological Society, London, Special Publications, 24:11-21, doi:10.1144/GSL.SP.1986.024.01.03 --- S. B. Smithson: A physical model of the lower crust from North America based on seismic reflection data / Geological Society, London, Special Publications, 24:23-34, doi:10.1144/GSL.SP.1986.024.01.04 --- V. Haak and R. Hutton: Electrical resistivity in continental lower crust / Geological Society, London, Special Publications, 24:35-49, doi:10.1144/GSL.SP.1986.024.01.05 --- J. Hall: The physical properties of layered rocks in deep continental crust / Geological Society, London, Special Publications, 24:51-62, doi:10.1144/GSL.SP.1986.024.01.06 --- D. S. Chapman: Thermal gradients in the continental crust / Geological Society, London, Special Publications, 24:63-70, doi:10.1144/GSL.SP.1986.024.01.07 --- J. F. Dewey: Diversity in the lower continental crust / Geological Society, London, Special Publications, 24:71-78, doi:10.1144/GSL.SP.1986.024.01.08 --- N. J. Kusznir and R. G. Park: Continental lithosphere strength: the critical role of lower crustal deformation / Geological Society, London, Special Publications, 24:79-93, doi:10.1144/GSL.SP.1986.024.01.09 --- K. Weber: Metamorphism and crustal rheology—implications for the structural development of the continental crust during prograde metamorphism / Geological Society, London, Special Publications, 24:95-106, doi:10.1144/GSL.SP.1986.024.01.10 --- S. A. F. Murrell: The role of deformation, heat, and thermal processes in the formation of the lower continental crust / Geological Society, London, Special Publications, 24:107-117, doi:10.1144/GSL.SP.1986.024.01.11 --- K. Fuchs: Intraplate seismicity induced by stress concentration at crustal heterogeneities—the Hohenzollern Graben, a case history / Geological Society, London, Special Publications, 24:119-132, doi:10.1144/GSL.SP.1986.024.01.12 --- K. Lambeck: Crustal structure and evolution of the central Australian basins / Geological Society, London, Special Publications, 24:133-145, doi:10.1144/GSL.SP.1986.024.01.13 --- R. W. Kay and S. M. Kay: Petrology and geochemistry of the lower continental crust: an overview / Geological Society, London, Special Publications, 24:147-159, doi:10.1144/GSL.SP.1986.024.01.14 --- J. Touret: Fluid inclusions in rocks from the lower continental crust / Geological Society, London, Special Publications, 24:161-172, doi:10.1144/GSL.SP.1986.024.01.15 --- S. R. Taylor and S.M. McLennan: The chemical composition of the Archaean crust / Geological Society, London, Special Publications, 24:173-178, doi:10.1144/GSL.SP.1986.024.01.16 --- R. L. Rudnick and S. R. Taylor: Geochemical constraints on the origin of Archaean tonalitic-trondhjemitic rocks and implications for lower crustal composition / Geological Society, London, Special Publications, 24:179-191, doi:10.1144/GSL.SP.1986.024.01.17 --- D. A. Carswell and S.J. Cuthbert: Eclogite facies metamorphism in the lower continental crust / Geological Society, London, Special Publications, 24:193-209, doi:10.1144/GSL.SP.1986.024.01.18 --- S. Moorbath and P.N. Taylor: Geochronology and related isotope geochemistry of high-grade metamorphic rocks from the lower continental crust / Geological Society, London, Special Publications, 24:211-220, doi:10.1144/GSL.SP.1986.024.01.19 --- B. F. Windley and J. Tarney: The structural evolution of the lower crust of orogenic belts, present and past / Geological Society, London, Special Publications, 24:221-230, doi:10.1144/GSL.SP.1986.024.01.20 --- C. Pin and J. D. Sills: Petrogenesis of layered gabbros and ultramafic rocks from Val Sesia, the Ivrea Zone, NW Italy: trace element and isotope geochemistry / Geological Society, London, Special Publications, 24:231-249, doi:10.1144/GSL.SP.1986.024.01.21 --- S. Robertson: Evolution of the late Archaean lower continental crust in southern West Greenland / Geological Society, London, Special Publications, 24:251-260, doi:10.1144/GSL.SP.1986.024.01.22 --- L. Schiøtte, D. Bridgwater, K.D. Collerson, A.P. Nutman, and A.B. Ryan: Chemical and isotopic effects of late Archaean high-grade metamorphism and granite injection on early Archaean gneisses, Saglek-Hebron, northern Labrador / Geological Society, London, Special Publications, 24:261-273, doi:10.1144/GSL.SP.1986.024.01.23 --- D. M. Shaw, J. J. Cramer, M. D. Higgins, and M. G. Truscott: Composition of the Canadian Precambrian shield and the continental crust of the earth / Geological Society, London, Special Publications, 24:275-282, doi:10.1144/GSL.SP.1986.024.01.24 --- M. Raith and P. Raase: High grade metamorphism in the granulite belt of Finnish Lapland / Geological Society, London, Special Publications, 24:283-295, doi:10.1144/GSL.SP.1986.024.01.25 --- R. C. Newton and E.C. Hansen: The South India-Sri Lanka high-grade terrain as a possible deep-crust section / Geological Society, London, Special Publications, 24:297-307, doi:10.1144/GSL.SP.1986.024.01.26 --- H.-G. Stosch, G. W. Lugmair, and H.A. Seck: Geochemistry of granulite-facies lower crustal xenoliths: implications for the geological history of the lower continental crust below the Eifel, West Germany / Geological Society, London, Special Publications, 24:309-317, doi:10.1144/GSL.SP.1986.024.01.27 --- H. Downes and A. Leyreloup: Granulitic xenoliths from the French Massif Central—petrology, Sr and Nd isotope systematics and model age estimates / Geological Society, London, Special Publications, 24:319-330, doi:10.1144/GSL.SP.1986.024.01.28 --- J. R. Broadhurst: Mineral reactions in xenoliths from the Colorado Plateau; implications for lower crustal conditions and fluid composition / Geological Society, London, Special Publications, 24:331-349, doi:10.1144/GSL.SP.1986.024.01.29 --- P. W. C. van Calsteren, N. B. W. Harris, C. J. Hawkesworth, M. A. Menzies, and N. W. Rogers: Xenoliths from southern Africa: a perspective on the lower crust / Geological Society, London, Special Publications, 24:351-362, doi:10.1144/GSL.SP.1986.024.01.30 --- W. L. Griffin and S. Y. O’Reilly: The lower crust in eastern Australia: xenolith evidence / Geological Society, London, Special Publications, 24:363-374, doi:10.1144/GSL.SP.1986.024.01.31

Anmerkung: Table of Contents: Copyright; Additional copies. - Foreword and acknowledgements. - Chapter 1. Cosmochemistry of the Rare Earth Elements: Condensation and Evaporation Processes / by William V. Boynton. - Introduction. - Meteorites. - Astrophysical context for interpretation of cosmochemical data. - Solar nebula. - Solar abundances. - Cosmochemical properties of the REE. - REE condensation reactions. - Activity coefficients. - Partial pressures. - Solid / gas distribution coefficients. - Why are the REE volatilities so different?. - Calculated REE patterns. - Early condensates. - Removing REE in the gas. - Comparison with meteoritic data. - Ultra-refractory component. - Group II inclusions. - FUN inclusions. - REE condensation as a function of oxygen fugacity. - Rims on CAI. - What have we learned from the REE?. - High temperatures were achieved in the solar nebula. - A very efficient mechanism for gas/dust separation existed in the solar nebula. - The high nebular temperatures existed for a long time. - A very intense, very brief, heat source also existed. - The solar nebula was a chaotic environment. - Summary. - Acknowledgements. - References. - Chapter 2. Radiogenic Isotope Geochemistry of Rare Earth Elements / by P. Jonathan Patchett. - Introduction. - Long-lived radioactive isotopes of Rare Earth Elements. - 138La-138Ce decay. - 147Sm-143Nd decay. - 176Lu-176Hf decay. - Cemical variations of La/Ce, Sm/Nd and Lu/Hf ratios. - Geochronological studies. - La-Ce and Lu-Hf chronology. - Sm-Nd chronology. - Defining bulk planetary isotopic evolution. - Isotopic study of planetary interiors. - The Moon. - The Earth. - Nd isotopes in studies of terrestrial crustal evolution. - Model Nd ages of continental crust. - Growth curves for the continental crust. - Origin of granitoids. - Nd isotopes and the sedimentary system. - Characterization of whole crustal terranes. - Crustal Lu-Hf isotopic studies. - Major unsolved problems. - Continental crustal growth curve. - Abundance of Archean continental crust. - Origin of mantle isotopic variations. - References. - Chapter 3. Partitioning of Rare Earth Elements between Major Silicate Minerals and Basaltic Melts / by Gordon A. McKay. - Introduction. - Usefulness of the REE for petrogenetic modelling. - Scope of this chapter. - Caveat. - How partition coefficients are measured. - Phenocryst/matrix studies of natural samples. - Experimental measurement of partition coefficients. - Basic experimental approach. - Equilibrium. - Percent level doping technique. - Beta-track mapping technique. - Other experimental approaches. - Henry's law: The applicability of percent-level doping results. - Factors governing mineral/melt partitioning. - Ionic size and charge of trace element. - Crystal field effects. - Cristallographic versus defect sites: The Henry's law question. - Phase compositions. - Oxidation state. - Thermodynamic relationships: Dependence of partitioning on temperature and composition. - Other predictive approaches. - Special applications. - Eu as an oxygen fugacity indicator. - Origin of the Eu anomaly in lunar mare basalts. - REE partition coefficient patterns for the major minerals. - Plagioclase. - Olivine. - Pyroxene. - Low-Ca pyroxene. - High-Ca pyroxene. - Garnet. - Future directions. - Acknowledgements. - References. - Chapter 4. An Approach to Trace Element Modeling Using a Simple Igneous System as an Example / by Gilbert N. Hanson. - Introduction. - Review of trace element equations. - Melting. - Fractional crystallization. - Melting versus fractional crystallization. - Essential structural constituents. - Example of petrogenetic approach. - Discussion and summary. - Acknowledgements. - References. - Chapter 5. Rare Earth Elements in Upper Mantle Rocks / by W. F. McDonough and Fredrick A. Frey. - Introduction. - Massive peridotites. - Massive peridotites: dominantly lherzolite Western Alps - Lanzo. - Western Alps -Baldissero, Balmuccia. - Eastern Liguria, Italy. - Western Liguria, Italy. - Eastern Pyrenees - France. - Ronda, Spain Effects of late stage alteration on REE. - What can be inferred about the melting process and the segregated melts?. - Massive peridotites: pyroxenite layers and veins and their wall rocks. - Amphibole-bearing pyroxenite veins. - Anhydrous pyroxenite layers. - How were the pyroxenite layers created? Evidence for multistage processes. - Implications for mantle enrichment processes (metasomatism). - Massive peridotites: dominantly harzburgite. - Oceanic peridotites. - Ultramafic xenoliths. - Group I spinel peridotites. - Garnet peridotites. - Pyroxenite and related xenoliths. - Models for REE abundance trends in peridotite xenoliths. - Megacrysts, minerals in xenoliths and damong inclusions. - Megacrysts. - Minerals in peridotites and pyroxenites. - Inclusions in diamonds. - Summary: comparison of peridotites from massifs and xenoliths and implications of REE data for Upper Mantle composition. - Acknowledgements. - References. - Chapter 6. Rare Earth Elements in Metamorphic Rocks / by Richard I. Grauch. - Introduction. - REE residence in metamorphic rocks. - REE mobility during metamorphism. - REE content of metamorphic rocks. - Suggestions for future work. - Acknowledgements. - References. - Chapter 7. Rare Earth Elements in Sedimentary Rocks: Influence of Provenance and Sedimentary Processes / by Scott M. McLennan. - Introduction. - Rare earth element properties and sedimentary rocks. - Cosmochemical considerations. - Geochemical considerations. - Aqueous geochemistry. - Normalizing and notation. - Sedimentary processes. - Weathering. - Diagenesis. - Sedimentary sorting. - REE and provenance studies. - Sedimentary rocks and crustal abundances. - Sedimentation and plate tectonics. - Archean sedimentary rocks and the Archean crust. - Archean greenstone belts. - REE in sedimentary rocks and crustal evolution. - Acknowledgements. - References. - Chapter 8. Aqueous Geochemistry of Rare Earth Elements / by Douglas G. Brookins. - Introduction. - The trivalent lanthanides (Ln III). - Types of complexes in solution. - Hydrolysis products. - Phosphate complexes. - Carbonate complexes. - Halide complexes. - Complexes with total dissolved sulfur. - Gadolinium-Terbium fractionation?. - Scandium and Yttrium. - Europium (II). - Cerium (IV). - Eh-pH diagrams. - Cerium. - Europium. - Other lanthanides. - Lanthanides in ocean waters. - Lanthanides and actinides. - Concluding remarks. - Acknowledgements. - References. - Chapter 9. Rare Earth Elements in Lunar Materials / by Larry A. Haskin. - Introduction. - The nature of planet moon. - The magma ocean hypothesis and its presumed products. - Lunar REE patterns. - Highland plutonic rocks. - Anorthosites. - Durâtes, troctolites, norites, and gabbros. - Lunar felsite (granite). - Highland volcanic rocks: KREEP. - Mare basalts. - Mare basalt sources as magma ocean products. - Assimilation of crusted material during basalt petrogenesis. - Glassy spherules. - Soils and breccias. - Caveat. - Acknowledgements. - References. - Chapter 10. Compositional and Phase Relations among Rare Earth Element Minerals / by Donald M. Burt. - Introduction. - Geochemical background. - Minerals. - Coupled substitutions. - Vector treatment. - Application to selected mineral groups. - Fluorides. - Carbonates. - Fluorocarbonates. - Monazite, xenotime, zircon, and related phases. - Apatites. - Florencite and related phases. - A-B oxides (niobates, tantalates, titanates, ferrites). - Fergusonitelbetafergusonite, ABO4. - Perovskite, ABO3. - Aeschyniteleuxenite, AB2O6. - Pyrochlore, A1-2B2O6(O,F,OH). - Allanite. - Titanite. - Garnet. - Gadolinite. - Chevkinite/perrierite. - Element distributions: acid-base relations. - Summary. - Acknowledgemen

Anmerkung: Continental Rift Basins --- H. G. Reading: African Rift tectonics and sedimentation, an introduction / Geological Society, London, Special Publications, 25:3-7, doi:10.1144/GSL.SP.1986.025.01.01 --- A. T. Grove: Geomorphology of the African Rift System / Geological Society, London, Special Publications, 25:9-16, doi:10.1144/GSL.SP.1986.025.01.02 --- African Rift Basin Development --- J. D. Fairhead: Geophysical controls on sedimentation within the African Rift Systems / Geological Society, London, Special Publications, 25:19-27, doi:10.1144/GSL.SP.1986.025.01.03 --- B. R. Rosendahl, D. J. Reynolds, P. M. Lorber, C. F. Burgess, J. McGill, D. Scott, J. J. Lambiase, and S. J. Derksen: Structural expressions of rifting: lessons from Lake Tanganyika, Africa / Geological Society, London, Special Publications, 25:29-43, doi:10.1144/GSL.SP.1986.025.01.04 --- B. H. Baker: Tectonics and volcanism of the southern Kenya Rift Valley and its influence on rift sedimentation / Geological Society, London, Special Publications, 25:45-57, doi:10.1144/GSL.SP.1986.025.01.05 --- L. A. J. Williams and G. R. Chapman: Relationships between major structures, salic volcanism and sedimentation in the Kenya Rift from the equator northwards to Lake Turkana / Geological Society, London, Special Publications, 25:59-74, doi:10.1144/GSL.SP.1986.025.01.06 --- C. J. Swain, N. J. Skinner, and M. A. Khan: Depth to metamorphic basement in the Koobi Fora region from seismic and gravity data / Geological Society, London, Special Publications, 25:75-84, doi:10.1144/GSL.SP.1986.025.01.07 --- R. T. Watkins: Volcano-tectonic control on sedimentation in the Koobi Fora sedimentary basin, Lake Turkana / Geological Society, London, Special Publications, 25:85-95, doi:10.1144/GSL.SP.1986.025.01.08 --- Siliciclastic, Chemical, Pedogenic and Organic Sediments in Contemporary Rift Environments --- I. Reid and L. E. Frostick: Slope processes, sediment derivation and landform evolution in a rift valley basin, northern Kenya / Geological Society, London, Special Publications, 25:99-111, doi:10.1144/GSL.SP.1986.025.01.09 --- L. E. Frostick and I. Reid: Evolution and sedimentary character of lake deltas fed by ephemeral rivers in the Turkana basin, northern Kenya / Geological Society, London, Special Publications, 25:113-125, doi:10.1144/GSL.SP.1986.025.01.10 --- A. S. Cohen, D. S. Ferguson, P. M. Gram, S. L. Hubler, and K. W. Sims: The distribution of coarse-grained sediments in modern Lake Turkana, Kenya: implications for clastic sedimentation models of rift lakes / Geological Society, London, Special Publications, 25:127-139, doi:10.1144/GSL.SP.1986.025.01.11 --- R. F. Yuretich: Controls on the composition of modern sediments, Lake Turkana, Kenya / Geological Society, London, Special Publications, 25:141-152, doi:10.1144/GSL.SP.1986.025.01.12 --- P. I. Abell and J. P. McClory: Sedimentary carbonates as isotopic marker horizons at Lake Turkana, Kenya / Geological Society, London, Special Publications, 25:153-158, doi:10.1144/GSL.SP.1986.025.01.13 --- R. W. Renaut, J. J. Tiercelin, and R. B. Owen: Mineral precipitation and diagenesis in the sediments of the Lake Bogoria basin, Kenya Rift Valley / Geological Society, London, Special Publications, 25:159-175, doi:10.1144/GSL.SP.1986.025.01.14 --- H. P. Eugster: Lake Magadi, Kenya: a model for rift valley hydrochemistry and sedimentation? / Geological Society, London, Special Publications, 25:177-189, doi:10.1144/GSL.SP.1986.025.01.15 --- R. Crossley: Sedimentation by termites in the Malawi Rift Valley / Geological Society, London, Special Publications, 25:191-199, doi:10.1144/GSL.SP.1986.025.01.16 --- J. Casanova: East African Rift stromatolites / Geological Society, London, Special Publications, 25:201-210, doi:10.1144/GSL.SP.1986.025.01.17 --- A. Hamilton and D. Taylor: Mire sediments in East Africa / Geological Society, London, Special Publications, 25:211-217, doi:10.1144/GSL.SP.1986.025.01.18 --- Sedimentary History of African Rift Basins --- J. J. Tiercelin: The Pliocene Hadar Formation, Afar depression of Ethiopia / Geological Society, London, Special Publications, 25:221-240, doi:10.1144/GSL.SP.1986.025.01.19 --- M. A. J. Williams, Getaneh Assefa, and D. A. Adamson: Depositional context of Plio-Pleistocene hominid-bearing formations in the Middle Awash valley, southern Afar Rift, Ethiopia / Geological Society, London, Special Publications, 25:241-251, doi:10.1144/GSL.SP.1986.025.01.20 --- R. Bonnefille, C. Robert, A. M. Lezine, G. Perinet, G. Delibrias, C. Elenga, J. P. Herbin, and J. J. Tiercelin: Palaeoenvironment of Lake Abijata, Ethiopia, during the past 2000 years / Geological Society, London, Special Publications, 25:253-265, doi:10.1144/GSL.SP.1986.025.01.21 --- P. G. Williamson and R. J. G. Savage: Early rift sedimentation in the Turkana basin, northern Kenya / Geological Society, London, Special Publications, 25:267-283, doi:10.1144/GSL.SP.1986.025.01.22 --- A. Hill, G. Curtis, and R. Drake: Sedimentary stratigraphy of the Tugen Hills, Baringo, Kenya / Geological Society, London, Special Publications, 25:285-295, doi:10.1144/GSL.SP.1986.025.01.23 --- C. K. Nyamweru: Quaternary environments of the Chalbi basin, Kenya: sedimentary and geomorphological evidence / Geological Society, London, Special Publications, 25:297-310, doi:10.1144/GSL.SP.1986.025.01.24 --- R. B. Owen and R. W. Renaut: Sedimentology, stratigraphy and palaeoenvironments of the Holocene Galana Boi Formation, NE Lake Turkana, Kenya / Geological Society, London, Special Publications, 25:311-322, doi:10.1144/GSL.SP.1986.025.01.25 --- A. Vincens, J. Casanova, and J. J. Tiercelin: Palaeolimnology of Lake Bogoria (Kenya) during the 4500 BP high lacustrine phase / Geological Society, London, Special Publications, 25:323-330, doi:10.1144/GSL.SP.1986.025.01.26 --- N. Thouveny and M. Taieb: Preliminary magnetostratigraphic record of Pleistocene deposits, Lake Natron Basin, Tanzania / Geological Society, London, Special Publications, 25:331-336, doi:10.1144/GSL.SP.1986.025.01.27 --- Sedimentation and the Preservation of Fossil Faunas --- R. L. Hay: Role of tephra in the preservation of fossils in Cenozoic deposits of East Africa / Geological Society, London, Special Publications, 25:339-344, doi:10.1144/GSL.SP.1986.025.01.28 --- M. Pickford: Sedimentation and fossil preservation in the Nyanza Rift System, Kenya / Geological Society, London, Special Publications, 25:345-362, doi:10.1144/GSL.SP.1986.025.01.29 --- C. Denys, J. Chorowicz, and J. J. Tiercelin: Tectonic and environmental control on rodent diversity in the Plio-Pleistocene sediments of the African Rift System / Geological Society, London, Special Publications, 25:363-372, doi:10.1144/GSL.SP.1986.025.01.30