The book ""The Bala Volcanic Series of Caernarvonshire and Associated Rocks: Being the Sedgwick Prize Essay for 1888"" by Alfred Harker is a detailed geological study of the Bala Volcanic Series located in Caernarvonshire, Wales, and the rocks associated with it. The author, Alfred Harker, was awarded the Sedgwick Prize for his essay on this topic in 1888.The book begins with an introduction to the Bala Volcanic Series, which is a sequence of volcanic...