‘The intelligent layman has long suspected circular reasoning in the use of rocks to date fossils and fossils to date rocks. The geologist has never bothered to think of a good reply, feeling the explanations are not worth the trouble as long as the work brings results. This is supposed to be hard-headed pragmatism.’

J.E. O’Rourke, ‘Pragmatism versus materialism in stratigraphy’. American Journal of Science, vol. 276, January 1976, p.48.