A harvesting header is disclosed that comprises a support frame and a crop moving apparatus supported on the support frame and operable for moving cut crop material to a transfer region. The header also has a cavity located proximate and lower than an output end of the crop moving apparatus. The header has a crop flow assistance device having a plurality of transversely spaced elements that extend generally longitudinally at least partially above the cavity, and which are operable to assist cut crop material in being transferred from the output end of the moving apparatus to flow over the cavity. The cavity may be operable to receive rocks and/or debris carried by the conveyor to the transfer region. The header may include a rock trap located in the transfer region the cavity being part of the rock trap and may be operable to receive rocks and/or debris carried by the conveyor to the transfer region.