114 Professor Jameson an the Geogmsikal Relations 
earth than had been suspected by geologists. Werner confines it 
almost entirely to the clay-slate formation ; and Von Buch con- 
jectures that it may be the oldest rock with which we are ac- 
quainted. Both of these statements are incorrect; for it is found 
associated with nearly all the Primitive Rocks of authors ; also 
with those of the Transition class, and is even included in Sand- 
stone ; and as there is no satisfactory evidence of one primitive 
rock being older than another, the whole class appearing to be a 
simultaneous crystallization, there is no reason why quartz-rock, 
which occurs along with all the others, should be viewed as the 
oldest 
Imbedded Quartz-Rock, 
Quartz-rock occurs in masses, in rocks of different kinds. 
These imbedded masses, according to their magnitude, form hil- 
locks, hills, or ranges of hills. The strata around these masses 
have the same positions as are observed with imbedded masses 
of granite ; and the lines of junction of the quartz with the ad- 
jacent strata, exhibit intermixtures, transitions, and veins, as in 
granite. 
Quartz-Rock in Beds. 
The tabular masses or beds of quartz-rock are sometimes so 
thick and extensive as to form whole hills ; and their lines of 
junction exliibit the usual appearance of veins, intermixtures and 
transitions. 
Quartz-Rock in Veins, 
Veins of this rock are very frequently met with in some dis- 
tricts, and these are occasionally several fathoms wide, and of 
considerable extent. 
Rocks in which Quartz-Rock occurs. 
Quartz-rock, like granite, sometimes occurs in large im- 
bedded masses in syenite.^ and also in masses and veins in grar- 
* The arrangements that occur in Galloway, on the east coast of Sutherland and 
Caithness, on the sides of Loch Ness, and in several neighbouring districts, on the 
west coast of Ross-shire, Inverness-shire, and in several of the Hebrides, seem to 
lead to the conclusion, that the transition rocks, and certain kinds of red sandstone, 
belong to the same grand division as the primitive rocks. We intend to give a 
full enumeration of the faots illustrative of this view in a future Number. 
