Fig. 3

a Geological map of south-west Tobago (after Donovan 1989, fig. 1, redrawn from Saunders & Muller-Merz 1985,  fig. 1). The inset map shows the position of Tobago (arrowed) in the eastern Caribbean. b Schematic reconstruction of the palaeoenvironment of the mid-Pliocene Balanus Bed, Rockly Bay Formation, of Tobago (after Donovan 1989,  fig. 7). Relationships between localities not to scale. Vertical scale approximates both to water depth and bed thickness