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Excerpt from An Introduction to the Geology of Cape Colony
Before describing the geological structure Of the Colony, it will be convenient to give a general account Of the various groups of rocks that built it up. The classification Of these rocks, which will be used in this book, is on pages 4 and 5.
The pre-cape rocks are a heterogeneous collection of sediments and igneous rocks both extrusive and intrusive. The sediments can be divided into two great groups, those Older than the intrusions of granite and those which were laid down subsequently to the intrusion. It is unfortunately not known whether there was more than one period during which intrusion of granite took place, but it is possible that the Bechuanaland granite is older than that Of Prieska and Upington. The later sedimentary rocks were folded and subjected to pro longed denudation prior to the deposition of the Cape system.
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