The term Skiddaw Slates is the name given to all the sedimentary and contemporaneous volcanic deposits of the Lake District and its neighbourhood, which lie below the Borrowdale Volcanic Series. Mr. Marr has shown (Geol. Mag. 1894, p. 122) that the main outcrop of these beds lies north of the mass of volcanic rocks which constitute the central hills of Cumbria. This outcrop seems to be continued in a south-south-easterly direction across the eastern end of Ulleswater to Shap, though it is partly covered by a deposit of Carboniferous Conglomerate.