Lacustrine/palustrine ratio for the Chattian and Aquitanian cycles. Each cycle is organized in five steps; Chattian cycles (Grand Gandaillat quarry) with a low carbonate versus clastic ratio with thin microbial-rich buildups, presence of pure illite and intense desiccation cracks in the palustrine deposits; Aquitanian cycles (Chadrat and Jussat outcrops and Créchy quarry) with a high carbonate versus siliciclastic ratio with thick microbial and metazoan buildups (see Fig. 5 for caption). The main characteristics of the steps are detailed.