Stable oxygen and carbon isotope cross plots of gastropods from this study and other studies from the Paris and Hampshire Basins, in blue and green shades, respectively. Suspension feeders Turritella sulcifera (Andreasson and Schmitz, 1996), Turritella imbricataria (Andreasson and Schmitz, 2000) and Sigmesalia multisulcata (Huyghe et al., 2012a) are shown as squares, carnivores Eoconus edwardsi (this study) and Eoconus deperditus (this study) as triangles and deposit feeders/grazers Campanile giganteum (de Winter et al., 2020a) as stars, with standard deviation as horizontal and vertical bars. Vertical bars show total range of δ¹³C for suspension feeders, carnivores and deposit feeders/grazers, with thicker bars showing the ranges of averages.