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.
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