This map was produced by merging the Pre-Kalahari Geological Map of the Republic of Botswana (1998) with the Central Kalahari Aeromagnetic Interpretation Project (2006) and Interpretation of Aeromagnetic Data of Northern Botswana Project (2022). The project boundaries of the three maps are shown in the index.
A national litho-stratigraphic framework was created based on the document Survey of Botswana Guidelines of codes used in Geological Databases (Kellner, 2001) to standardize units and structures mapped within each project area. Subsequently the Central Kalahari and Interpretation of Aeromagnetic Data of Northern Botswana Project areas were clipped from the 1998 Pre-Kalahari National Map and updated lithology and structures from the two more recent projects inserted. Geophysical data was then used to resolve discrepancies between lithologies and structures between projects. The national aeromagnetic map and its derivative products served as the primary reference and was supported by the national gravity data and radiometric data covering eastern Botswana. Contacts and structures away from the project suture paths were largely left unchanged unless warranted by the geophysical data.
Map Notes
The geophysical interpretation map delineates the Pre-Kalahari geological units that show a geophysical response. As the boreholes demonstrate, there may be one or more overlying sedimentary units that are not interpreted since they do not have a recognizable geophysical expression (e.g. very low magnetic susceptibility).