Ireland has long been the focus of research into its geological foundations and history. This book provides insights into the evolution of geological ideas in Ireland, gives assessments of underrepresented scientists, and offers an appreciation of the value of geological collections for historical research. Through a series of twenty-two papers, this volume provides syntheses and analyses of aspects of this geological research and places the role of a number of individuals firmly within context. The topics discussed include the considerations of the nature of igneous rocks, aspects of geological mapping of the country, the role played by Irish scientists in determining the age of the Earth, and the importance of early mineralogical and geological collectors and the role their collections made to advancing geological knowledge both in Ireland and Europe. The Making of Irish Geology 1740-1940 will appeal to both the general and academic reader interested in the development of the geological sciences, with a particular focus on Ireland.