Inclined Strata and Trellis Drainage

If north is assumed up, strata dip to the southwest in the left thumbnail and to the south in the right. Stronger strata form the topographically high ridges, which form the strike direction of the strata along which the properties remain relatively constant. Where drainage ways intersect strata, ridges form "v's", which  point down dip as is shown in the illustration (Hamblin & Howard, 1975). Drainage in the left thumbnail is constrained by the parallel strong layers and forms a classic trellis pattern. Home