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SAHRIS | SAHRIS
9/2/018/0232
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Post date: 07/08/2012
Archive Import
History: Below the sea wall at the extreme southern end of Beach Road in Sea Point the rocks show remarkakle and unusually interesting geological features. Here ot)e may observe an outstanding example of the contact between dark shales of the Malmesbury Series and the intrusive lighter-coloured Cape Granite. One of South Africa’s most eminent geologists, the late Dr. Alex L. du Toit, described the occurrence in the following terms:— “The contacts (of the Younger or Cape granites) at Sea Point and in the Platteklip Ravine under Table Mountain have long been famous, having been first mentioned by Capt Basil Hall in 1813 and described in detail by Cohen in 1874. On the beach at Sea Point the junction is a most instructive one, the slates being penetrated by such a network of granite veins that an intimate mixture of sedimentary and igneous matter forming a belt several hundreds of feet wide lies between the spotted slates and the main granite body. The coarsely porphyritic nature of the granite in contact with the slates and in the narrow veins that penetrate them is extraordinary. In many of these strips the bedding planes are recognisable and their boundaries are sharp; in others there is a gradual transition, and grey streaky migmatite rocks have been produced in which well formed microline crystals an inch or two (50 mm) in length often form ‘eyes’. It has been suggested thaf in the migmatite zone plastic flow was followed by feldspathisation and the development of porphyroblasts of microline.” This occurrence was first recorded in 1818 by Clark Abel and has since then been quoted in many publications. Amongst those who described it was Charles Darwin, who visited the site in 1836. It made a major contribution to the geologists’ basic conception of the relationship between sedimentary and igneous rocks and consequently has an important place in the history of geological science.
Proclaimed 1953"
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