A combine harvester (10) is provided with a conveyance system (100, 200, 300, 400, 500, 600, 700) for transporting crop material discharged by overhead grain separating apparatus to a grain cleaning shoe (42). The conveyance system comprises a series of oscillating pans which move the grain in a generally longitudinal direction. A return pan (138, 238, 338, 438, 538, 638, 738, 838) conveys the collected material forwardly to a front discharge edge from where the material falls onto a stratification pan (40) below. The stratification pan conveys the collected material rearwardly to a rear discharge edge from where the material falls into the grain cleaning shoe (42). At least one of the return pan and the stratification pan is non-rectangular and has a non-transverse discharge edge. A combine harvester (10) is provided with a conveyance system (100, 200, 300, 400, 500, 600, 700) for transporting crop material discharged by overhead grain separating apparatus to a grain cleaning shoe (42). The conveyance system comprises a series of oscillating pans which move the grain in a generally longitudinal direction. A return pan (138, 238, 338, 438, 538, 638, 738, 838) conveys the collected material forwardly to a front discharge edge from where the material falls onto a stratification pan (40) below. The stratification pan conveys the collected material rearwardly to a rear discharge edge from where the material falls into the grain cleaning shoe (42). At least one of the return pan and the stratification pan is non-rectangular and has a non-transverse discharge edge.
