An important feature of the coal industry, which recent events have brought into sharp prominence, is the great diversity of conditions between different coalfields and different collieries.
These mines extend under the waves like the coalfields at Newcastle.
Both analyses reveal a clustering of the coalfields into three main groupings.
Those from the other coalfields are likely to be other species.
Diversity of sigillarians in particular coalfields is more complicated.
This sequence is easily correlated across the coalfield.
The coalfield valleys in the south were extremely narrow, so that the characteristic mining village was a long, thin strip wedged between the mountains.
It is hoped that these coalfields will, in time, be included within future comparisons.
