In boyhood, he gained a knowledge of plants from his grandfather, who was an apothecary, and later he qualified as a doctor in medicine. Pursuing the study of botany in various parts of France and other countries, he began to take notice of the relation between the distribution of plants and the soils and subsoils. In this way his attention came to be directed to minerals and rocks.
In 1746, he communicated to the Academy of Sciences in Paris a memoir on the distribution of minerals and rocks, and this was accompanied by a map on which he had recorded his observations. He thus, as remarked by W. D. Conybeare, "first carried into execution the idea, proposed by Martin Lister years before, of geological maps." In the course of his journeys he made a large collection of fossils and figured many of them, but he had no clear ideas about the sequence of strata.
In 1759, Guettard was elected a foreign member of the Royal Swedish Academy of Sciences.
He died in Paris on the 7th of January 1786.
His publications include:
- Observations sur les plantes (2 vols, 1747)
- Histoire de la découverte faite en France de matières semblables à celles dont la porcelaine de la Chine est composée (1765)
- Mémoires sur différentes parties des sciences et arts (5 vols, 1768–1783)
- Mémoires sur la minéralogie du Dauphiné (2 vols, 1779).
See The Founders of Geology, by Sir A Geikie (1897).
See also Edit