. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CAMPANIAN AND MAASTRICHT!AN OSTRACODA 39 Umzamba by Chapman (1904, 1923) and is similar in lateral outline to P. nibelaensis, but lacks the anterodorsal concavity. P. nibelaensis is a characteristic species of the Upper Campanian-Maas- trichtian faunas of south-east Africa, locally comprising 9 per cent of the Maastrichtian I ostracod Fig. 18. Muscle scars, Pontocyprella nibelaensis sp. nov., SAM-K5687, locality 113-3, Nibela Peninsula, RV, Campanian IV. Scale bar 90fx. Dimensions (mm) l
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CAMPANIAN AND MAASTRICHT!AN OSTRACODA 39 Umzamba by Chapman (1904, 1923) and is similar in lateral outline to P. nibelaensis, but lacks the anterodorsal concavity. P. nibelaensis is a characteristic species of the Upper Campanian-Maas- trichtian faunas of south-east Africa, locally comprising 9 per cent of the Maastrichtian I ostracod Fig. 18. Muscle scars, Pontocyprella nibelaensis sp. nov., SAM-K5687, locality 113-3, Nibela Peninsula, RV, Campanian IV. Scale bar 90fx. Dimensions (mm) length height K5685 0,91 0,40 K5686 0,94 0,44 K5687 0,87 0,38 Age, distribution, palaeoecology Campanian IV to Maastrichtian III (Nibela and Monzi areas of Zululand, and Agulhas Bank). P. nibelaensis occurs in ostracod assemblages 4b, 5a, 5b, 6-7 (Fig. 15B), and seems to have preferred quiet, deep-water environments (>500 m, outer shelf/upper continental slope). Superfamily cytheracea Baird, 1850 The numerical importance of the Cytheracea within the Campanian-Maas- trichtian ostracod populations of south-east Africa (as monitored in Zululand) is directly contolled by changes in palaeosedimentary environments in time and space: in the shallower water environments the superfamily constitutes between 40 and 60 per cent, whereas in deeper-water environments this figure drops to between 20 and 30 per cent. Thus, on Figure 67 there is a sharp decline in the cytheracean percentage (50% to 20%) just above the Campanian I—II boundary in the Richards Bay BH-9 borehole, and a similarly dramatic decline (40% to 20%) in the lower part of Campanian IV at outcrops to the north in Zululand. As will be explained in a later section, these changes are mirrored in other facets. 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 work.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
