How does a trellis pattern typically form?

A trellis pattern typically forms in areas underlain by alternating bands of resistant and less resistant rock due to the differential erosion of these materials. When streams and rivers flow over such geologically diverse terrains, the more resistant rocks tend to remain relatively intact, while the less resistant rocks erode more quickly. This process creates a landscape where streams flow parallel to the resistant rock formations and intersect with tributaries cutting through the less resistant material at perpendicular angles. The resulting pattern resembles a trellis, with the longer rivers mimicking the main framework and the shorter tributaries acting as the crossbar elements. This geomorphological feature is commonly observed in regions with a complex geology, showcasing the influence of rock type on drainage patterns.