covering it have become converted by heat into a species ofporcelain jasper, beautifully striped by the various degrees ofoxidation induced iu the irou it contains.
Section IV.
INDICATIONS OF COAL NEAR TIIE LICKEY HILL.
Mr. Buckland has observed some broken and confused tracesof coal-measures and of transition lime near the north foot ofthe quartz rock of Lickey hill, a few miles south from this coal-field ; and it has been reported that old coal-works exist inAshby heath, about six miles south-east of the Lickey, Butthis statement rests on no good authority.
CHAPTER IV.
Western Coal Districts.
The coal-fields referred to this division, may be generallydescribed as disposed around the transition district of Northand South Wales. They may conveniently be subdivided intoA. the north-western, including the coal-fields of Anglesey andFlintshire. B. the western, or those of Shropshire , and C. thesouth-western, or the three important coal-basins of South Wales ,of Monmouthshire , aud that of South Gloucester and Somerset.
Section I.
Nvrlh-zeeslerti , or North Welsh Coal-fields.
1. ISLE OF ANGLESEY.
The first then of these coal-fields w hich requires our attentionis that contained in the Isle of Anglesey.
A remarkable valley traverses the w hole of this island, runningnearly parallel with the Menai Straits, and at the distance ofabout six miles from them : this opens on the south into theasstuary of Maltraetli, and on the north into Redwharf Bay.This valley is flanked on both sides by parallel belts of car-boniferous limestone, in the depression between which, coal has
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