The Salt Cellar, a gritstone tor on Derwent Edge in the Peak District, Derbyshire, England.
Grit or gritstone is a coarse sandstone. Grit is usually formed
in a river delta where material eroded
from a landmass has been deposited rapidly before the fragments have been
rounded or sorted. The Upper Carboniferous deltas left thick beds of grit in many areas of the British isles.