In the Lake District, northwestern England, the Skiddaw group (Silurian) outcropping in the vicinity of Keswick includes four formations--Hope Beck slates, Loweswater flags, Mosser-Kirk Stile slates, and Latterbarrow sandstone, with a total thickness of about 5,900 feet. The Hope Beck is a new formation erected for the lowest slate beds of the group. The formations are described, and the graptolite fauna of the Loweswater and Mosser-Kirk Stile formations are listed. The source of the sediments is considered to have been to the south. One exposure of a lava flow in the Loweswater flags indicates volcanism during deposition. It is noted that the effects of the thermometamorphic aureole described by Dixon in 1931 can be seen in sections of the Loweswater and Mosser-Kirk Stile formations, and are represented by the occurrence of andalusite and tourmaline. The intrusive body does not reach the surface but is thought to be an extension of the Eskdale or Skiddaw granite.