Weathering and Erosion
|[Note Guidelines] Photographer's Note|
|Belated contribution to the Friday theme.|
Hot molten magma intruded these Upper Permian (260 Million years old) sedimentary strata during the Jurassic Period about 160 million years ago and solidified by crystallization to form a sill of dolerite. Water seeping down along cooling joints from the surface causes weathering of the dolerite to a material locally called "sabunga" which is very suitable for surfacing of gravel roads. Where two or three joint systems intersect, weathering is more intense at the corners, resulting in the remaining fresh dolerite sections to become rounded and ultimately almost perfectly spherical boulders. Eventually it will all be converted into sabunga and then into a soil which, although fertile, is very dense and not suitable for supporting building foundations as it contracts and expands during droughts and after rains, respectively, causing buildings to crack.
shaukatmi, suzley, brech has marked this note useful
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Hi, Neels.Weathering and erosion a constant process of nature produces these awesome sights. This is a lovely composition of the rocks and sediment. Good light and exposure control with amazing sharpness and clarity.Cheers.
- [2012-09-23 1:17]
Great additio to the theme, I so like the subtle tones here, shapes too and the way the light bounces across the eye catching stone...love it. tfs