Unique in Western Europe, the English Riviera Global Geopark is geologically renowned for its 350-400 million year old Marine Devonian limestones of great historical importance. The rich faunas yielded by these rocks were used, in part, to characterize the original Devonian System of the pioneering geologists Sedgwick and Murchison which was named after Devon the county within which the Geopark is situated. In addition, excellent exposures of classic desert sandstone and breccia in the 300-250 million years old Permian "Red Bed" sequences are recorded. The limestones themselves also include important Quaternary karstic features such as Kents Cavern. Pengelly's excavations of the caves in the nineteenth century influenced public opinion worldwide as to the antiquity of man.