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One of the concerns of this book is to demonstrate that geology has a relevance to the study of rocks as construction materials and this chapter sets the geolo- gical scene for the book. Newcomers to geology are often put off by the jargon in the form of special names for rocks, minerals, fossils and geological periods and by what seems to be the lack of practical relevance of many aspects of the subject. One of the considerations in writing this chapter was to dispel this antipathy by providing comprehensible definitions of geological terms and including only those aspects of geology relevant to the use of rocks in construction.
Nevertheless, it is recognized that the chapter may be difficult to assimilate at first reading by the non-geologist and, because of this, boxed items are provided which, it is suggested, the non-geologist should read first. These provide simple explanations of several concepts of importance to the use of rockin construction, especially discontinuities, rock classification
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