. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Berg River Baard's Quarry /,0 km ?LBW PRESENT 0 Phosphate LBW Langebaanweg station AK Anyskop Contours in metres above present sea- level km. Fig. 4. The Langebaanweg area today. during this period, one in the late Paleocene/early Eocene and the other in the late Eocene (Siesser & Dingle 1981). There are records of Eocene marine deposits at 70 and 163 m on the west coast in the southern Namib Desert (Bogenfels and Buntfeldschuh—Siesser & Dingle 1981), as well as possible Eocene deposits at ab
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Berg River Baard's Quarry /,0 km ?LBW PRESENT 0 Phosphate LBW Langebaanweg station AK Anyskop Contours in metres above present sea- level km. Fig. 4. The Langebaanweg area today. during this period, one in the late Paleocene/early Eocene and the other in the late Eocene (Siesser & Dingle 1981). There are records of Eocene marine deposits at 70 and 163 m on the west coast in the southern Namib Desert (Bogenfels and Buntfeldschuh—Siesser & Dingle 1981), as well as possible Eocene deposits at about 140 m at Buffels Bank (Kamaggas) west of Springbok (South African Museum records), and of uncertain elevation at Quaggaskop near Vanrhynsdorp (Lamont 1947). If the latter records are indeed Eocene, then the shorelines of this period must have abutted the western escarpment in Namaqualand, whereas in the downwarped southern Namib they approached the present coast near Bogenfels following the east-west trend of the Klinghardt Mountains in this area (Fig. 1). The implication is that during the Eocene transgressions much of the south-western Cape, including the Langebaanweg area, was below sea-level, the coastline being along higher ground many kilometres east of Langebaanweg. There was then a major regression spanning the entire Oligocene, and much or all of the early Miocene, when sea-level reached several hundred metres below that of the present (Siesser & Dingle 1981). This is likely to have been the period of major continental erosion during which all traces of early Tertiary sediments in the Langebaanweg area, and elsewhere along the west coast, were removed. It might have been during this period that the bedrock in the Langebaanweg area was eroded down to its present elevation of about —40 m. The early to middle Miocene transgression The presence of early Miocene vertebrates in fluviatile and lacustrine deposits near the coast of South West Africa between Bogenfe
Size: 1595px × 1567px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
