The pattern of a drainage network is strongly influenced by geological structure. Anastomotic drainage, developing on nearly horizontal, coarse sediments, is the division of a river into several channels, and annular or radial drainage—where the major rivers radiate from a centre—develops on domes, particularly where belts of resistant rock are separated by weaker belts. Centripetal drainage moves into a centre created by a crater or depression. Dendritic drainage—a branching, tree-like network—is most common on horizontally bedded or crystalline rocks, with uniform geology. Rectangular drainage has tributaries running at right angles to the major river and occurs on rocks with intersecting, rectangular joints and faults; contorted drainage is rectangular drainage on complex metamorphosed rocks. Trellised drainage resembles a trained fruit tree, usually found on dipping or folded sedimentary or weakly metamorphosed rocks. See Riedel et al. (2007) Geomorph. 91, 1–2 on structural controls on drainage patterns.