Cumberland Coalfield

The Cumberland Coalfield is a coalfield in Cumbria, north-west England. It extends from Whitehaven in the south to Maryport and Aspatria in the north.
Geology.
The following coal seams occur within the Coal Measures Group in this coalfield. Not all seams are present in any one part of the coalfield:
Middle Coal Measures Formation
There is also a Crow seam between the Metal and Bannock seams.
Lower Coal Measures Formation
Towards the top of the underlying Stainmore Formation (or Hensingham Formation), which is of Namurian age, are the: