Page 149 - Bulletin 11 2007
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                  Trigonometrical  Survey,  1952.  Topocadastral  map  of  the  Cape  Peninsula,  Sheet  II
                  (1:25,000 scale). Government Printer, Pretoria.


                  Watson,  J.,  1911.  British  and  Foreign  Building  Stones.  Cambridge  University  Press,

                  Cambridge, United Kingdom, 483p.


                  Wybergh,  W.,  1932.  The  building  stones  of  the  Union  of  South  Africa.  Memoir,

                  Geological Survey of South Africa, 29, 244p.
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