Braided alluvial sediments: basic vertical sequence with binary 2 m structures of coarse-and fine- grain units but the fine is less than the coarse in thickness Abandoned channel Sand deposition Mud deposition sequence In active in abandoned braided channels channel Active channel sequence 2.3 Physiography and sediments of a braided alluvial channel system. After Selley( 1978).Braided alluvial sediments: basic vertical sequence with binary structures of coarse- and fine￾grain units, but the fine is less than the coarse in thickness