 These are the Ennerdale and Eskdale granites, formed around 450 million years ago in the Ordovician Period.This was stated in (publicly available) document 285 of the West Cumbria MRWS, a letter written by Dr Dearlove, the consultant geologist recruited by MRWS.Three smaller surface exposures of the batholith occur at Shap, Threlkeld and Skiddaw, but these are too small to be considered for the Geological Disposal Facility.