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Etchplanation involves 2 processes namely deep weathering followed by exhumation. Deep weathering refers to rapid chemical weathering and this causes rock paricles to further disintegrate into even smaller particles. This occurs when rainwater enters cracks and crevices in rocks thus exposing the rock to greater surface area of weathering. This process of deep weathering occurs during the warm pliocene period and results in a deep layer of weather materials. Exhumation or removal of weathered materials happens during periglacial times due to flash floods or solifluction. Hence, this can expose the basal surface of weathering ( the limit to weathering- from completely weathered rocks in the upper layers to unjointed basal suface). Outcrop in the basal surface that is exposed in the surface is formed as inselberg. In places whereby there are orthogonal joints, tors may be formed after repeated process of etchplanation. This will exposed corestones that are more resistant to weathering due to more spacious jointing that stack on top of one another to form heaps of boulders 4-20m high. Spheroidal weathering may occur on the side of the corestones (form of exfoliation) resulting in the rounded nature of the core stone.

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Etchplanation theory is a geological concept that explains the formation of certain landforms, particularly in arid environments. It posits that landscape features, such as plateaus and mesas, form through a combination of erosion and sediment deposition, where softer rock layers are eroded away, leaving behind more resistant rock. The term "etchplanation" refers to the process of etching out these landforms from the original geological structure. This theory emphasizes the role of both chemical weathering and physical erosion in shaping the Earth's surface.


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Pediplanation is the process where wind-blown sand particles erode surfaces by abrasion, smoothing and planing them down over time. On the other hand, etchplanation refers to the chemical dissolution of mineral surfaces by acidic solutions, resulting in the formation of etch pits or grooves on the surface. Both processes play a role in shaping landscapes through surface erosion and dissolution.


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The main difference between etchplanation and pediplanation is at the second stage of their granite weathering processes. At the second stage of the etchplanation weathering process, exhumation occurs downwards, weathering granite vertically - resulting in steep sided granite landforms such as inselbergs or tors. For the pediplanation process however, exhumation occurs laterally, forming usually broad and gently sloping land surfaces. Accompanying the pediplanation process are usually river erosion processes, thus further widening the valley and even forming extensive plains (pediplanes).


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