The Gambia President Adama Barrow changed the name back to "Republic of The Gambia". Arab traders provided the first written accounts of the Gambia area in the ninth and tenth centuries. During the tenth century, Muslim merchants and scholars established communities in several West African commercial centres. Both groups established trans-Saharan trade routes, leading to a large export trade of local people as slaves, also gold and ivory, as well as imports of manufactured goods. By the 11th or 12th century, the rulers of kingdoms such as Takrur, a monarchy centred on the Senegal River just to the north, ancient Ghana and
Geology of Gambia Geology of Gambia The geology of Gambia is defined by thick and comparatively recent sequences of sediments and sedimentary rocks, deposited in the last 66 million years. The country is underlain almost entirely by geologically recent Cenozoic sedimentary rocks. Much deeper basement rocks are likely present, although they are not well understood. Most research has focused on oil and groundwater exploration. The oldest rock units recognized in the west of the country, along the Gambia River are sandstones and kaolinitic claystones from the Oligocene, Miocene or Pliocene. Ironstone, including iron oxides, gravel, clay and sand dating to the Pleistocene are