(Table 4) Stratigraphic ranges of selected Oligocene planktonic foraminifers ...
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VA = very abundant, A = abundant, C = common, F = few, VF = very few, R = rare, VR = very rare, X = present. 1 = very abundant, very good preservation; 2 = medium abundant, good...
VA(Very Abundant,极丰富)、A(Abundant,丰富)、C(Common,常见)、F(Few,少量)、VF(Very Few,极少量)、R(Rare,稀少)、VR(Very Rare,极稀少)、X(Present,存在)。1级:丰度极高,保存状态极佳;2级:丰度中等,保存良好……



