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Palaeozoic, Mesozoic and Kainozoic: a Geological Disaster
Published online by Cambridge University Press: 01 May 2009
Extract
In all modern textbooks of stratigraphy the fundamental basis of the classification is the division of the rocks of the earth's crust into four great groups, each of which carries a variety of names but all agree in a hard and fast demarcation of the stratigraphical column. Each of these major groups comprises a certain number of systems, as to whose definition there is on the whole general agreement.
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