Fig. 3From: The planktonic foraminifera of the Jurassic. Part I: material and taxonomyCorrelation of Jurassic strata in six Grand Banks wells, based on foraminifera. Zones 3, 4 and 6 are locally rich in Jurassic planktonic foraminifera (after Gradstein 1976 and Stam 1986)Back to article page