. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CAMPANIAN AND MAASTRICHT!AN OSTRACODA 137 CYTHERACEA. BAIRDIACEA & CYTHERELLIDAE CYPRIDACE A Fig. 68. Triangular (CCBC) plot of Campanian-Maastrichtian ostracod populations from Zululand (Richards Bay BH-9 borehole and outcrops at Nibela Peninsula, Monzi, and Mfolozi River). Individual samples (crosses) from the Agulhas Bank, Igoda, and Needs Camp are also plotted. Assemblage fields 4a, b-7 are delimited by major discontinuities ('Bythocypris', 'Bairdoppilata', and 'Cytherella' lines) which are d
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CAMPANIAN AND MAASTRICHT!AN OSTRACODA 137 CYTHERACEA. BAIRDIACEA & CYTHERELLIDAE CYPRIDACE A Fig. 68. Triangular (CCBC) plot of Campanian-Maastrichtian ostracod populations from Zululand (Richards Bay BH-9 borehole and outcrops at Nibela Peninsula, Monzi, and Mfolozi River). Individual samples (crosses) from the Agulhas Bank, Igoda, and Needs Camp are also plotted. Assemblage fields 4a, b-7 are delimited by major discontinuities ('Bythocypris', 'Bairdoppilata', and 'Cytherella' lines) which are discussed in the text. The 'Cytheracea' line demarcates areas in which cytheraceans dominate (above) and do not dominate (below). Assemblage fields 1-3 identified in Santonian strata in the BH-9 borehole (Dingle 1980) are shaded. cluster below the BH-9 assemblage 4 field, yet have very close affinities with it. Similarly, several faunas cluster within the BH-9 assemblage 5 field, yet lie between two other assemblage fields (6-7) that were not encountered in the borehole. Clearly, a redefinition of assemblages 4 and 5 is necessary, but in such a way as to emphasize their internal similarities. Useful in this regard has been the recognition of three important boundaries shown in Figure 68: the 10 per cent (total ostracod) contour of Bythocypris richardsbayensis (the 'Bythocypris line'); a line to the left of which Bairdoppilata is the dominant ostracod (the 'Bairdoppilata line'); and a line to the right of which Cytherella sp. is the dominant ostracod (the 'Cytherella line'). Reference to Figures 68 and 69 shows that the assemblage fields can now be defined in terms of these lines, in addition to other parameters on Figure 67, and Table 6. A summary of the more important characters of the various ostracod assemblages graphically shown in Figures 67-69 and listed in Table 6 now follows:. Please note that these images are extracted from scanned page images that may have been digital
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
