African Geographic Pictures Collection
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| Image number: | 88 |
| Feature : | gnamma |
| Grouping : | weathering |
| Discipline : | geomorphology |
| Year : | 1970 |
| Locality : | Zing |
| Country : | Nigeria |
| Region - tribe : | Shebshi Mountains |
| Physiographic region : | West-African rain belt |
| Notice : | Gnammas often affect granitic rocks |
| Reference : | Moeyersons, Jan, 1970 Image 88. In : Moeyersons, Jan : "African Geographic Pictures", http://www.africamuseum.be/en/research/collections_libraries/earth_sciences/collections/geopic" |