trellis drainage pattern

A trellis drainage pattern is a geological formation where streams develop in a pattern resembling a garden trellis. This pattern emerges in areas with folded rock structures, where differential erosion of softer rock layers creates valleys parallel to the fold axes. Stronger rock formations then form ridges, with smaller feeder streams running down their sides. This results in a main stream aligned with the weak rocks and smaller tributaries flowing down the slopes of the ridges. This pattern is distinct from dendritic patterns, which occur in flat-lying rocks, or radial patterns, which form around volcanic cones or domes.12