This pattern of drainage usually develops on alternating bands of hard and soft strata are called trellis.
What is trellis drainage pattern?
- Experts explain the trellis drainage pattern as a sign of structural control by several types of degraded and bent sedimentary rocks.
- In a humid area, the valleys are formed by non-resistant rocks like shale and limestone, while the ridges are formed by resistant rocks like sandstone.
- The Trellis drainage system, or the Trellis River pattern, is the one that we can mostly locate over the southern areas of a map.
- Sometimes, a dip angle can be seen, which results in the asymmetric ridges.
- When sub-parallel streams erode a valley across softer formations and sides, it creates this kind of drainage pattern.
- These beds are primarily seen as steeply sloping surfaces that could also be folded.
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