The following coal seams occur within the Coal Measures Group in this coalfield.[2][3] Not all seams are present in any one part of the coalfield:
Middle Coal Measures Formation
- (series of unnamed coals)
- Brassy
- Black Metal
- Fireclay
- White Metal
- Little
- Slaty
- Tenquarters
- Rattler
- Bannock Band
- Main Band
- Lower Metal
- Yard Cannel Band
- Yard
- Lower Yard
There is also a Crow seam between the Metal and Bannock seams.
Lower Coal Measures Formation
- Half Yard
- Two Foot
- Little Main
- Eighteen Inch
- Lickbank
- Sixquarters
- Parrot
- Upper Threequarters Rider
- Upper Threequarters
- Lower Threequarters
- Upper Albrighton
- Middle Albrighton
- Lower Albrighton
- Harrington Four Foot
Towards the top of the underlying Stainmore Formation (or Hensingham Formation), which is of Namurian age, are the:
- Udale Coal
- Bedlam Gill Coal
- (unnamed coals)
