Mr. Martin’s "Description of the Mineral Eason , &c. 3^3 
and south direction, and not many miles in an east and west 
direction, and its utmost depth is not above 50 or 60 fathoms. 
5. The next stratum of coal, and those likewise beneath it, 
lie deeper and expand still longer and wider, and the lowest 
which are attended by parallel strata of iron ore, of which 
there are in some situations about 16 accompanied by irregular 
balls or lumps of iron ore, occupy the whole space between 
Llanmaddock Hill, near the entrance of Burry river, to 
Llanbidie, from the Mumbles to Cribbath, from Newton Down 
to Penderryn, from Castle Coch to Castle Morlais, and from 
Risca to Llangattock, and in length on the south side of the 
bason from Pontypool through Risca, Tinkwood, Llantrissent, 
Margam, Swansea Bay, and Cline Wood, to Llanmaddock 
Hill, and on the north side through Blaenafon, Ebbw, Sirhowy, 
Merthyr, Aberdare, Aberpergwm, Giyntowy, Llandibie, and 
the Great Mountain, to Pembrey Hill, near Llanelly in Car- 
marthenshire, and their depths are at the centre range of 
strata from 6 to 700 fathoms. 
6. The strata of coal and iron ore running from Pembrey 
Hill, through Carmarthen Bay and Pembrokeshire to St. 
Bride’s Bay, are only a continuation of those in the counties 
of Glamorgan and Carmarthen, which lie next to and parallel 
with the north side of the bason, all the remaining strata 
rising southward ; and the middle ranges on the north side of 
the bason, are lost between where they meet the sea near 
Llanmaddock Hill and the south side of Pembrey Hill, in their 
course towards Pembrokeshire, in consequence of a contraction 
of the sides of the mineral bason, or rather by its becoming 
shallower; for in Pembrokeshire none of the strata of coal 
or iron ore lie above 80 or 100 fathoms deep, consequently 
mdcccvl Y y 
