34B Mr. Martin’s Description of the Mineral Bason 
together, 40, 60, 80, or 100 fathoms, up or down, and still 
there is seldom any superficial appearance, that indicates a 
disjunction, for the largest faults frequently lie under even 
surfaces. 
14. As every stratum rises regularly from its base to the 
surface, and is frequently visible and bare, in precipices and 
deep dingles, and often discovered where the earth or soil is 
shallow in trenching, or in forming high roads, and by reason 
of the whole of the country within this boundary being so 
perforated by pits, and so intersected by the various opera- 
tions of art and nature, it is not probable that any vein of 
coal, iron ore, or other stratum remains undiscovered in this 
mineral bason. 
15. Glamorganshire engrosses far the greatest portion of 
coal and iron ore, Monmouthshire the next in point of 
quantity, Carmarthenshire the next, Pembrokeshire the next, 
and Brecknockshire possesses the least. 
16. The strata of coal and iron ore in the last named 
county, which are the lowest in the bason, break out north- 
ward, and only take place in the three following distinct 
spots, viz. 1st. From Turch River (which is the boundary 
between Lord Cawdor and Charles Morgan, Esq. ) across 
the river Tawe and the Drin Mountain to the great forest of 
Brecon. 2d. A corner of ground from Blaen Romney to the 
north cf Brynoer. 3d. Another spot, from Rhyd Ebbw and 
Beaufort Iron Works, through Llwyn y Pwll, near Tavern 
Maed Sur, to where it joins Lord Abergavenny’s mineral 
property. 
17. Note. A principal fault is observable at Cribbath, 
where the beds or strata of the limestone stand erect : another. 
