It is referred to as the Kettleness Member .
It is includes the Pecten and Main Seams , the latter c. 1.8 metres thick and split into a 0.7 metre Top Block and 0.8 metre Bottom Block by 0.3 metre of medial shale at Old Nab .
It is referred to as the Kettleness Member , and includes the Pecten and Main Seams , the latter c. 1.8 metres thick and split into a 0.7 metre Top Block and 0.8 metre Bottom Block by 0.3 metre of medial shale at Old Nab .