Geckos were observed and collected around Gobabeb, the Namib Desert Research Station, during 5-10 August 1971. Some specimens were taken alive to Jerusalem, Israel, for studies of pupillary responses and reproduction.
Studies of granitic rock outcrops have been carried out in the McMurdo Oasis, Antarctica, and in the Namib Desert to test hypotheses of formation of large scale sheeting structures and of laminae. Laminae were also investigated in the Central Sahara. Evidence from Antarctica strongly supports the contention that sheeting may be a secondary feature resulting from unloading: evidence from the Namib is more equivocal but offers some support for this hypothesis.
The topography of Sandvis is briefly introduced and changes in the area, based on charts, descriptionbed. These show that the area has evolved, within 90 years, from an open harbour, suitable for large craft, to an almost completely landlocked generally shallow lagoon. A faunal list of the aquatic and marinal fauna is given. Excluding the planktonic component a total of 93 invertebrate and 25 vertebrates are recorded.
This investigation evaluates the role of terrestrial invertebrales in the process of degradation and secondary humification of litter. This process is known particularly in many temperate, humid and moderately humid environments but little is known about desert species. We have assessed the action of the digestive enzymes of some Namib Desert tenebrionid beetles feeding on dead vegetation.
Ventifacts cut from dolerite boulders are exposed along the flanks of the Swart bank berg in the Central Namib Desert. Approximately 93 per cent of all ventifacts studied have facets indicating that the dominant sand bearing wind has been from the north east. It is therefore concluded that this wind has played some part in preventing the extension of the Southern Namib dunes across the rock platform of the Central Namib.
Geomorphological aspects of the Kuiseb river catchment in central South West Africa are analysed. The characteristics of the Kuiseb drainage are compared with other Atlantic drainage systems in terms of pattern and discharge potential. The detailed morphology of Kuiseb longitudinal and cross profiles derived from map analysis are scrutinised and relevant terrace deposits are considered in an attempt to elucidate a sequential history for the catchment.
The history of the Central Namib includes the following: deposition, metamorphism and granitization of the Precambrian; planation of the Precambrian to form the Namib Unconformity Surface, an unweathered pediplain with a few inselbergs thought to be of Jurassic age; deposition of the Tsondab Sandstone, a terrestrial sandstone thought to be equivalent to the Kalahari System, and of Upper Cretaceous and Tertiary age; planation to form the Tsondab Planation Surface, a vast pediment crossed by east-west drainage; incision of the Tsondab and Kuiseb Rivers with formation of minor terraces: formation of the modern sand dunes.
Two major types of patterned ground and one minor type are found in the interdune valleys south of the Kuiseb River at Gobabeb and are particularly distinct after good rains (e.g. 1976 with 125 mm). The patterns are polygons bounded by straight lines with little regularity.