Geografie 1971, 76, 237-255
Geomorphological Development of Seashore of Indian Ocean in Vicinity of Dar-es-Salaam
The geomorphological development of Tanzanian shore appeared in a new light when investigations of deposits of black sands on the shore of Indian Ocean in vicinity of Dar-es-Salaam and some 15 km north of Bagamoyo were completed. As a result it is necessary to say that the development of the deposits of black sands occuring on recent seashore line as well as in older sediments cannot be elucidated apart from the solution of the problem of geomorphological development of the seashore as a whole. The main attention was paid to the solution of problems of the development of the seashare since the end of Pleistocene until the present. Since the last Interglacial, i. e. since the origin of the coastal terrace Mtoni, approximately three development cycles have passed. The oldest cycle was characterized by a gradual retreat of the sea, its final level being deep under the present sea level. In the second cycle - after a new sea transgression - the development stagnated, which favoured the growth of large mangrove forests and the development of coral reefs and beach rocks in shallow waters. The last cycle - lasting until the present - is characterized by the uplift of the seashore, which is partly due to accumulation, partly to erosion activities. Erosion affected the seashore as well as coral reefs aud sandy banks projecting above the water surface.
