Siccar Point and Teaching the History of Geology

The concept of the rock cycle and the “indefinite” length of geologic time were outlined first by James Hutton before he had ever seen an unconformity. Hutton drew general support of his theory from existing observations of unconformities from accounts in French, which he re-interpreted in light of his own ideas. Hutton then found his own field examples to test his ideas before coming upon Siccar Point. In summing up his evidence, which included wide-ranging observations on the geology of SE Scotland, Hutton himself did not cite Siccar Point. Inaccuracies concerning the role of Siccar Point in the development of James Hutton’s ideas remain as entrenched as ever in many physical geology textbooks. A more balanced appraisal of all contributions to Hutton’s work is warranted, particularly the contributions of French writers. Finally, an accurate presentation of Hutton’s method can contribute to students’ understanding of the nature of historical theories and in meeting the challenges of creationists.