. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 30 ANNALS OF THE SOUTH AFRICAN MUSEUM body of red sand banked against a cliff. The writer has assigned to it fragments with base as follows: Empangeni +73-+104 m Homeleigh against a cliff (Map 2 o3) +147 m Ncemane against a cliff (Map 3 o3) +90 m Hluhluwe (Map 3 o2) +73 m Mkuze Game Reserve (Map 4 o2) +95 m east of Lubombu Drift (Map 5ol) +90 m It seems therefore to rest on surfaces at +73 m and +90—[-100 m. The cliff at Ncemane is the most probable indicator of its altitude— it is associated wit
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 30 ANNALS OF THE SOUTH AFRICAN MUSEUM body of red sand banked against a cliff. The writer has assigned to it fragments with base as follows: Empangeni +73-+104 m Homeleigh against a cliff (Map 2 o3) +147 m Ncemane against a cliff (Map 3 o3) +90 m Hluhluwe (Map 3 o2) +73 m Mkuze Game Reserve (Map 4 o2) +95 m east of Lubombu Drift (Map 5ol) +90 m It seems therefore to rest on surfaces at +73 m and +90—[-100 m. The cliff at Ncemane is the most probable indicator of its altitude— it is associated with a marine platform at about +90 m; but it is possible that really two cordons are represented. There is no archaeological evidence for dating Cordon F; but there is no reason to suppose that any part of it is CONCLUSION: SUGGESTED PLEISTOCENE CHRONOLOGY All the cordons in Natal and Zululand were probably constructed during marine regressions, which uncovered abundant sand on the continental shelf. Their formation was probably rapid, as they do not include well-marked land- surfaces. So each dune was for a time mobile, but owing to changing conditions became fixed by vegetation. Fixation may have been due to continued regression, which removed the shore so far that beach-sand no longer reached the dune; but partial transgression, change of prevailing winds or aridity could reactivate it. So far as we know, the deepest regressions round the emerging sub-continent were in the Saale and Weichsel glaciation-cycles. To each of these cycles there are assigned two cordons, and there may be others offshore. Lack of informative exposures makes it difficult to study these dune- cordons. Natural drainage has incised the dunes but left slumped and heavily. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original w
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
