(Table 6) Nannoplankton occurrences in DSDP Site 90-590

Sediment depth is given in mbsf. Species abundance: A = abundant (>50 specimens), C = common (25-49 specimens), and R = rare (<25 specimens) - = absent, obtained by...沉积物深度以海底以下米（meters below seafloor，mbsf）为单位标注。物种丰度分级规则如下：A代表丰富（标本数＞50），C代表常见（标本数25~49），R代表稀有（标本数＜25），符号"-"表示缺失，该分级标准通过……获得。