. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. MARINE SANTONIAN AND CAMPAN1AN OSTRACODS 61 minor taxa occur in more than one assemblage (although several are confined to only two), but six species are restricted to only one. It is possible therefore to characterize each assemblage in terms of its dominant types (>20%) with, in three cases, additional specialized, but relatively rare, taxa. These associations are summarized in Table 3. At a more general level, reference to Table 1 shows. x:m borehole depths Fig. 32. Variations in the ostracod f
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. MARINE SANTONIAN AND CAMPAN1AN OSTRACODS 61 minor taxa occur in more than one assemblage (although several are confined to only two), but six species are restricted to only one. It is possible therefore to characterize each assemblage in terms of its dominant types (>20%) with, in three cases, additional specialized, but relatively rare, taxa. These associations are summarized in Table 3. At a more general level, reference to Table 1 shows. x:m borehole depths Fig. 32. Variations in the ostracod faunas of BH9, Richards Bay. Discontinuities in the various curves have been used to delimit ostracod assemblages 1 to 5 which are described in detail in the text and Tables 2-3. Population stability has been measured by variations in the similarity index between sample points up the borehole (ticks on the column marked borehole depth). Population turnover is a measure of the number of new appearances and extinctions in each sample, and the population diversity is calculated as number of species per hundred specimens. Note that for most of the borehole there is an inverse relationship between population diversity and the total number of valves per sample largest populations tend to be the least diverse. The only large deviation from this trend is in the lower part of ostracod assemblage I. These relationships may in part, however, be influenced by the statistical bias of dealing with small numbers of specimens. Note that in all cases, percentage of species and higher taxa quoted in this figure and in the text are based on three-point running mean 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 South African Museum. Cape Town : The Museum
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