Geology and Natural History. 139 
These lodes or veins have as yet been but very partially tested; 
it would, therefore, be premature to give any decided opinion on 
them; they may, however, prove the source of an amount of wealth 
the production of which would extend over many years. There 
ented geologist, Mr. D’Oyley Aplin, whose views on this subject 
colne ith my own observations. H — t 
no other description of tin ore than peroxide (cassiterite), even in 
i ve seen it, 18 asso- 
readily under atm eric influence. There are numerous band 
of loosely aggregated rock, granitoid in character, highly micace- 
ous, and tray s and veins of quartz in all directions; 
rainage, The crystals of tin ore are generally found embedded 
mM and along the margin of the quartz threads or veins in those 
Veins in the granite is generally northeast and southwest. Along 
the western margin of the granite a broad belt of metamorphic 
rocks (slates and sandstones) extends on both banks of the Severn, 
in pa 
difficult to traverse except on foot ; this tract of country stretches 
from five to six miles west of Ballandean to Maidenhea aware 
Severn, where the granite again appears and also the tin ore. No 
tin floors, as at the Elsmore mine, in New South Wales, have yet 
been discover 
e 
Curnal.)—Last August, while making some examination of 
rocks in the Wahsatch Mountains, in a position southeast : rg 
alt Lake City, I searched for fossils that would throw lig little 
the age of this magnificent mountain range ; and after a 
