Southern Africa, the land and its peoples . e period. When the ice melted the ocean returned to its former level anddrowned much of the shelf. Little modification f the coastline has occurred in recent harder rocks have resisted the onslaught of the w .ml form capes; the softer rocks, like those forming the synclinalvalleys of the Folded Region, have been eroded to form wide bays. On the other hand, sand carried b\ winds and currents has tended to obliterate irregularities in the shore-lii 50 INTRODUCTION South-West Africa, The most ancient rocks of this area areolder granites, gneis
Southern Africa, the land and its peoples . e period. When the ice melted the ocean returned to its former level anddrowned much of the shelf. Little modification f the coastline has occurred in recent harder rocks have resisted the onslaught of the w .ml form capes; the softer rocks, like those forming the synclinalvalleys of the Folded Region, have been eroded to form wide bays. On the other hand, sand carried b\ winds and currents has tended to obliterate irregularities in the shore-lii 50 INTRODUCTION South-West Africa, The most ancient rocks of this area areolder granites, gneisses, and altered and intensely folded formations are exposed in the Kaokovcld, in the south ofGreat Namaqualand, in that part of Damaraland extending fromRehoboth to Grootfontein, and in parts of the coast of the mountains of these areas are built of the older the ancient rocks are found ornamental stones such asmarble, coloured quartzite and blue phyllite, as well as beryl,copper and a, Sediments deposited on the ocean floor, thus increasing the pressure on the underlying magma. b, Movement of magma, causing uplift of the land-mass. The fundamental rocks are followed by the conglomerates,shales and red sandstones of the Konkip Series, exposed in asmall area between the Orange River and the Tsaris Mountains. The sediments of the Nama System, resting unconformablyupon the folded Konkip Series, are widely distributed. Theiralmost horizontal beds, which, except for faulting, have beenlittle disturbed, form extensive plateaux and bold escarpments. The Karroo System is represented by the Dwyka and EccaSeries and by the Stormberg lavas, exposed between the OrangeRiver and Kalkfontein, between Keetmanshoop and Mariental,and north of the Ugab River. The scenery is Northern Karrooin character, the period having been marked, as elsewhere inSouth Africa, by intrusions of dolerite. Tertiary and recent sediments cover two-fifths of the entire
Size: 3156px × 792px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1900, bookidsouthernafricala00hutc
