(Figure 3) Distribution of Maastrichtian calcareous nannofossils in ODP Hole ...
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Sediment depth is given in mbsf. Species abundance: A = abundant (more than 1 specimen per field of view; 1250 X); C = common (at least 1 specimen in 10 fields of view); F =...
沉积物深度以海底以下米（meters below sea floor，mbsf）为单位。物种丰度分级如下：A为丰富（放大1250倍下，每视野内标本数量超过1个）；C为常见（10个视野内至少可观察到1个标本）；F为……
