African Geographic Pictures Collection
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| Image number: | 1232 |
| Feature : | boulder exfoliation and splitting |
| Grouping : | weathering |
| Discipline : | pedology |
| Year : | 2005 |
| Locality : | Sai Island |
| Country : | Sudan |
| Region - tribe : | Nile valley |
| Physiographic region : | Desert-Sahara |
| Notice : | Exfoliation and splitting (Kernsprunge)as mechanical weathering forms of Nubian sandstone boulders. Freshly exposed rock surfaces are whitish. Other rock surfaces are garned by a 'desert varnish', a surficial chemical precipitation of iron and manganese, developing only on that part of the rock fragment receiving light. |
| Reference : | Moeyersons, Jan, 2005 Image 1232. In : Moeyersons, Jan : "African Geographic Pictures", http://www.africamuseum.be/de/research/collections_libraries/earth_sciences/collections/geopic" |