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Climate is a primary driver of sedimentary processes from source to sink. A key challenge for stratigraphic studies in deep time is to constrain how perturbations of hydroclimate in the past have affected surface processes and source-to-sink dynamics. In modern fluvial systems, precipitation and the global hydrological cycles are fundamental determinants of sediment production, transport and deposition, and have also long been shown to exert major influence on river channel dynamics. For instance, recent works suggest that increased seasonality in precipitation could enhance lateral river dynamics, through less-frequent but higher-energy flood events and decreased bank stability associated to droughts and vegetation decline. In such settings, channel mobility has more impact than water discharge on the export of fine sediments downsystem, hence predicting specific stratigraphic patterns potentially diagnostic of …