25Q ON THE GEOLOGY AND STATISTICS 
wood on ihe Merioneth side of the basin. But in the beau- 
tiful httle basin formed by the Mauddach, between Dol- 
gelly and Barmouth, the shores are adorned with rich na- 
tural copse- wood ; and among it the larch has been planted, 
and is thriving most luxuriantly. 
On the Carnarvon side of the Cardigan basin no work- 
able slate is found. At the north-east, as we approach the 
south front of Snowdon, where the rocks are similar to 
those found on the side of the Menai basin, hornblende, 
porphyry, basalt, quartz, asbestine slate, and hard clay- 
slate, occur. No limestone or marl have yet been discovered 
in the Carnarvonshire side of Cardigan Bay basin. In 
this quarter are several veins of copper. The only one 
that is wrought is on the banks of the Glassin, three 
miles to the east of Bethgelest. Copper was widiin 
these few years extensively raised in a mine close to Pont 
Aberglassin ; and about three miles to the south-west of 
Tremadoc, copper is also found, but not wrought. As we 
approach the south-west, or district of Lleyn, where the 
softer rocks abound, copper is no longer seen ; but in a 
hard rock, called Penryn Du, adjoining St TudwaFs 
Islands, to the south of Poolhelly, lead occurs. This mine 
belongs to the Marquis of Anglesea ; and has, in one year, 
yielded considerably more than 1000 tons of lead. It is 
found in a state of galena, or sulphuret. 
In addition to the mineral products of this basin, the 
ocean yields a rich treasure in its fish. A great variety 
of the best kinds of flat, and other sorts, are caught, and 
brought to market. In their season, great shoals of her- 
rings and mackarel visit the Bay, and plenty of salmon is 
also taken. 
As we remarked, before leaving the basin of Conway, 
that, in addition to the beauty of its scenery, and the va- 
riety of its productions, it could boast of much in the way 
