The layered structure of the hill is particularly clear here: the millstone grit cap overlies Carboniferous limestone (~300M years old), followed by the Yoredale series of limestones, shales and sandstones. The intermediate terrace is of Great Scar limestone, which overlies Silurian slates (~400M years old).
As I approached, I thought the diagonal path crossing the lower scree slopes was the route to the top, but the main path goes around the right and ascends on the other side of the dry stone wall visible at the extreme right of this photo.