The forms of rock slopes in the Cape Fold Mountains
The forms of rock slopes developed on the quartzitic sandstones of the folded Cape Supergroup strata are explained with reference to rock mass strength and the characteristics of rock masses. (AJC).
Rock mass strength as a control of slope development : evidence from Southern Africa
Rock Mass Strenght (RMS) theory is examined to quantify some of the factors involved in the development slope angles. Contrasting slope development profiles are related to RMS ratings and critical levels are identified. Classic slope decline
The role of rock properties in the development of bedrock-incised rills and gullies : examples from Southern Africa in Soil erosion and host materials in Africa.
Preliminary data on the influence of rock physical properties on the development of bedrock-incised rills and gullies examines at four localities in southern Africa : Mpafane, Lugxogxo, Mgqumeni, Loteni.
The relationship between gradient and the size of rock fragments on debris slopes on dolerite-capped inselbergs in the southern Orange Free State
A low correlation was found between slope angle and size of rock fragments on dolerite capped inselbergs, due to the slow rate of creep and rapid mass movement of larger fragments. - (AJC)
Rückschlüsse auf paläoklimatische Verhältnisse, abgeleitet aus Felsbildergenerationen in der westlichen Libyschen Sahara. (Generations of rock pictures of the western Libyan Sahara in its relation to the palaeoclimatic conditions)
Generations of rock pictures of the western Libyan Sahara are described and classified by the fauna depicted, by the techniques employed, and tentatively by stylistic development. They are related to radiocarbon dates. During the big-game and round
activity in the Ethiopian Plateau. The sediments which represent braided channel deposits were derived from local basement complex rocks and volcanic rocks of the Ethiopian Plateau.
Distinct traces of aeolian abrasion in rocks and the statistical distribution of ventifacts on land surfaces of the serir type were investigated along a N-S profile across the western central Sahara. Wind fluting everywhere may be explained
-high temperature Barrovian-type regional metamorphism whereas the absence of staurolite in these alumina-rich rocks is indicative of the high fugacity of oxygen during the metamorphism of the area.
The type of land use and the management influence soil erosion with time. Gullies and rills generally occur on lower parts of the catchment area which are mostly occupied by Sephula, Maseru, Rama and Matela soil series. Rock-stripping occurs
Reconnaissance et description des récifs coralliens de la région de Tuléar: pour chaque groupe récifal, morphologie des éléments des platiers, éperons, beach-rock, caye et phénomènes de sédimentation plus ou moins évolutifs en raison des conditions
The age of planation surfaces of SE Africa has been revised. The dominant surface cutting Pre-Cambrian and Lower Paleozoic rocks which L. King considered to be of post-African (locally African) Cenozoic age has been proved to be post-Gondvanian
Quantitative study of deep interfluve weathering in three humid low-relief crystalline rock areas in south-western Nigeria. The irregular contour of the basal weathering surface is evidenced in each study area. The deep weathering episode appears
Commonly rock-falls and landslides are triggered by even smaller north-african earthquakes. Some examples are given before 1954. Further liquefaction is known from larger earthquakes (e. g. 1856). More complex phenomena, seemingly at a geological