Burial of particulate organic carbon (POC) in sedimentary basins drives a long-term atmospheric CO 2 sink (e.g., France-Lanord & Derry, 1997) and creates paleoclimate archives (e.g., Hein et al., 2017). However, POC flux to depositional basins, and the paleoclimate conditions recorded therein, can be modulated during source to sink transit, analogous to how fluvial transport modifies environmental signals in clastic deposits (Hajek & Straub, 2017;Jerolmack & Paola, 2010). In lowland rivers, sediment exchange between rivers and floodplains can modify upstream-derived POC (
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