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Pedogenic mud aggregates are sand-size particles composed of clay flakes and silt grains, produced in vertic soils with expandable clays during seasonal cycles of wetting and drying. The aggregates are commonly reworked from floodplain soils and transported as bedload, but they tend to be destroyed by compaction during burial. Their identification is important for interpreting floodplain dynamics, i.e., bedload transport rather than suspension settling of clay. Expandable clays, principally smectite, are necessary for aggregate formation, and are commonly produced during weathering of mafic volcanicrocks and ash, which are prominent constituents of many rift-basin fills. To date, pedogenic mud aggregates...

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