Lesley.] 146 {June 16, 
depth of 100 feet. Besides which, there are in fact two beds cut in this 
shaft-tunnel, the smaller bed underlying the other, and with a dip which 
would carry the two beds together at some distance beneath the floor. 
Fig? Ground plan of He Sargeant Shaft and Sturnel. 
Vertical Section of the Sarme. 
A 7 
A 
| ee 
mes a vi bay 
Xe WF 4 Z 
: Seale, Ho ft. ta the meh. ) 
These ore-beds are not ore-veins ; for they do not cut through the rocks 
crosswise. They have no well defined walls ; they have no selvages ; there 
is no gangue-rock different from the rocks on each side ; they have, there- 
fore, not been formed in crevices subsequently in a later age after the 
uptilting of the formation ; they have neither been ejected voleanically 
from below, nor infiltrated aqueously from above, nor secreted chemically 
from the wall rocks ; in a word they are not at all ‘‘yeins.’? On the con- 
trary they are ‘beds ;”’ beds deposited, like the rest of the rocks, in water ; 
deposited in the same age with the rocks which hold them; are in fact 
rock-deposites highly charged with iron; and they differ from the rest of y 
the rocks of the formation in no respect, excepting this: that they are 
more highly churged with iron. 1 can best represent the facts of the case 
by an ideal diagram of the rocks of the ore-belt in their original horizontal 
position, somewhat thus: 
Fie. 9. 
In fact all our primary (magnetic and other) iron-ore beds obey this law. 
