Two samples of London Clay Formation were examined for their microfaunal content with a view to determine their biostratigraphical position. That from Roxwell (TL 657000 880000) contained foraminifera consistent with zones B, C and basal D. The sample from Hollingson Quarry (TL 453000 126000) was decalcified, but contained common diatoms preserved as pyrite indicative of Zone A to mid B
